CWE-828
Signal Handler with Functionality that is not Asynchronous-Safe
The product defines a signal handler that contains code sequences that are not asynchronous-safe, i.e., the functionality is not reentrant, or it can be interrupted.
CVE-2024-20309 (GCVE-0-2024-20309)
Vulnerability from cvelistv5 – Published: 2024-03-27 17:02 – Updated: 2024-08-09 18:34
VLAI?
Summary
A vulnerability in auxiliary asynchronous port (AUX) functions of Cisco IOS XE Software could allow an authenticated, local attacker to cause an affected device to reload or stop responding.
This vulnerability is due to the incorrect handling of specific ingress traffic when flow control hardware is enabled on the AUX port. An attacker could exploit this vulnerability by reverse telnetting to the AUX port and sending specific data after connecting. A successful exploit could allow the attacker to cause the device to reset or stop responding, resulting in a denial of service (DoS) condition.
Severity ?
5.6 (Medium)
CWE
- CWE-828 - Signal Handler with Functionality that is not Asynchronous-Safe
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Cisco | Cisco IOS XE Software |
Affected:
3.7.0S
Affected: 3.7.1S Affected: 3.7.2S Affected: 3.7.3S Affected: 3.7.4S Affected: 3.7.5S Affected: 3.7.6S Affected: 3.7.7S Affected: 3.7.4aS Affected: 3.7.2tS Affected: 3.7.0bS Affected: 3.7.1aS Affected: 3.8.0S Affected: 3.8.1S Affected: 3.8.2S Affected: 3.9.1S Affected: 3.9.0S Affected: 3.9.2S Affected: 3.9.1aS Affected: 3.9.0aS Affected: 3.2.0SE Affected: 3.2.1SE Affected: 3.2.2SE Affected: 3.2.3SE Affected: 3.3.0SE Affected: 3.3.1SE Affected: 3.3.2SE Affected: 3.3.3SE Affected: 3.3.4SE Affected: 3.3.5SE Affected: 3.10.0S Affected: 3.10.1S Affected: 3.10.2S Affected: 3.10.3S Affected: 3.10.4S Affected: 3.10.5S Affected: 3.10.6S Affected: 3.10.2tS Affected: 3.10.7S Affected: 3.10.1xbS Affected: 3.10.8S Affected: 3.10.8aS Affected: 3.10.9S Affected: 3.10.10S Affected: 3.11.1S Affected: 3.11.2S Affected: 3.11.0S Affected: 3.11.3S Affected: 3.11.4S Affected: 3.12.0S Affected: 3.12.1S Affected: 3.12.2S Affected: 3.12.3S Affected: 3.12.0aS Affected: 3.12.4S Affected: 3.13.0S Affected: 3.13.1S Affected: 3.13.2S Affected: 3.13.3S Affected: 3.13.4S Affected: 3.13.5S Affected: 3.13.2aS Affected: 3.13.0aS Affected: 3.13.5aS Affected: 3.13.6S Affected: 3.13.7S Affected: 3.13.6aS Affected: 3.13.7aS Affected: 3.13.8S Affected: 3.13.9S Affected: 3.13.10S Affected: 3.6.2aE Affected: 3.6.2E Affected: 3.6.5bE Affected: 3.6.7bE Affected: 3.6.9E Affected: 3.6.10E Affected: 3.14.0S Affected: 3.14.1S Affected: 3.14.2S Affected: 3.14.3S Affected: 3.14.4S Affected: 3.15.0S Affected: 3.15.1S Affected: 3.15.2S Affected: 3.15.1cS Affected: 3.15.3S Affected: 3.15.4S Affected: 3.3.0SQ Affected: 3.3.1SQ Affected: 3.4.0SQ Affected: 3.4.1SQ Affected: 3.5.0SQ Affected: 3.5.1SQ Affected: 3.5.2SQ Affected: 3.5.3SQ Affected: 3.5.4SQ Affected: 3.5.5SQ Affected: 3.5.6SQ Affected: 3.5.7SQ Affected: 3.5.8SQ Affected: 3.16.0S Affected: 3.16.1S Affected: 3.16.1aS Affected: 3.16.2S Affected: 3.16.2aS Affected: 3.16.0cS Affected: 3.16.3S Affected: 3.16.2bS Affected: 3.16.3aS Affected: 3.16.4S Affected: 3.16.4aS Affected: 3.16.4bS Affected: 3.16.5S Affected: 3.16.4dS Affected: 3.16.6S Affected: 3.16.7S Affected: 3.16.6bS Affected: 3.16.7aS Affected: 3.16.7bS Affected: 3.16.8S Affected: 3.16.9S Affected: 3.16.10S Affected: 3.17.0S Affected: 3.17.1S Affected: 3.17.2S Affected: 3.17.1aS Affected: 3.17.3S Affected: 3.17.4S Affected: 16.1.1 Affected: 16.1.2 Affected: 16.1.3 Affected: 16.2.1 Affected: 16.2.2 Affected: 16.3.1 Affected: 16.3.2 Affected: 16.3.3 Affected: 16.3.1a Affected: 16.3.4 Affected: 16.3.5 Affected: 16.3.5b Affected: 16.3.6 Affected: 16.3.7 Affected: 16.3.8 Affected: 16.3.9 Affected: 16.3.10 Affected: 16.3.11 Affected: 16.4.1 Affected: 16.4.2 Affected: 16.4.3 Affected: 16.5.1 Affected: 16.5.1a Affected: 16.5.1b Affected: 16.5.2 Affected: 16.5.3 Affected: 3.18.0aS Affected: 3.18.0S Affected: 3.18.1S Affected: 3.18.2S Affected: 3.18.3S Affected: 3.18.4S Affected: 3.18.0SP Affected: 3.18.1SP Affected: 3.18.1aSP Affected: 3.18.1bSP Affected: 3.18.1cSP Affected: 3.18.2SP Affected: 3.18.2aSP Affected: 3.18.3SP Affected: 3.18.4SP Affected: 3.18.3aSP Affected: 3.18.3bSP Affected: 3.18.5SP Affected: 3.18.6SP Affected: 3.18.7SP Affected: 3.18.8aSP Affected: 3.18.9SP Affected: 16.6.1 Affected: 16.6.2 Affected: 16.6.3 Affected: 16.6.4 Affected: 16.6.5 Affected: 16.6.4a Affected: 16.6.5a Affected: 16.6.6 Affected: 16.6.7 Affected: 16.6.8 Affected: 16.6.9 Affected: 16.6.10 Affected: 16.7.1 Affected: 16.7.1a Affected: 16.7.1b Affected: 16.7.2 Affected: 16.7.3 Affected: 16.7.4 Affected: 16.8.1 Affected: 16.8.1a Affected: 16.8.1b Affected: 16.8.1s Affected: 16.8.1c Affected: 16.8.1d Affected: 16.8.2 Affected: 16.8.1e Affected: 16.8.3 Affected: 16.9.1 Affected: 16.9.2 Affected: 16.9.1a Affected: 16.9.1b Affected: 16.9.1s Affected: 16.9.3 Affected: 16.9.4 Affected: 16.9.3a Affected: 16.9.5 Affected: 16.9.5f Affected: 16.9.6 Affected: 16.9.7 Affected: 16.9.8 Affected: 16.10.1 Affected: 16.10.1a Affected: 16.10.1b Affected: 16.10.1s Affected: 16.10.1c Affected: 16.10.1e Affected: 16.10.1d Affected: 16.10.2 Affected: 16.10.1f Affected: 16.10.1g Affected: 16.10.3 Affected: 16.11.1 Affected: 16.11.1a Affected: 16.11.1b Affected: 16.11.2 Affected: 16.11.1s Affected: 16.12.1 Affected: 16.12.1s Affected: 16.12.1a Affected: 16.12.1c Affected: 16.12.1w Affected: 16.12.2 Affected: 16.12.1y Affected: 16.12.2a Affected: 16.12.3 Affected: 16.12.8 Affected: 16.12.2s Affected: 16.12.1x Affected: 16.12.1t Affected: 16.12.4 Affected: 16.12.3s Affected: 16.12.3a Affected: 16.12.4a Affected: 16.12.5 Affected: 16.12.6 Affected: 16.12.1z1 Affected: 16.12.5a Affected: 16.12.5b Affected: 16.12.1z2 Affected: 16.12.6a Affected: 16.12.7 Affected: 16.12.9 Affected: 16.12.10 Affected: 16.12.10a Affected: 17.1.1 Affected: 17.1.1a Affected: 17.1.1s Affected: 17.1.1t Affected: 17.1.3 Affected: 17.2.1 Affected: 17.2.1r Affected: 17.2.1a Affected: 17.2.1v Affected: 17.2.2 Affected: 17.2.3 Affected: 17.3.1 Affected: 17.3.2 Affected: 17.3.3 Affected: 17.3.1a Affected: 17.3.1w Affected: 17.3.2a Affected: 17.3.1x Affected: 17.3.1z Affected: 17.3.4 Affected: 17.3.5 Affected: 17.3.4a Affected: 17.3.6 Affected: 17.3.4b Affected: 17.3.4c Affected: 17.3.5a Affected: 17.3.5b Affected: 17.3.7 Affected: 17.3.8 Affected: 17.3.8a Affected: 17.4.1 Affected: 17.4.2 Affected: 17.4.1a Affected: 17.4.1b Affected: 17.4.2a Affected: 17.5.1 Affected: 17.5.1a Affected: 17.6.1 Affected: 17.6.2 Affected: 17.6.1w Affected: 17.6.1a Affected: 17.6.1x Affected: 17.6.3 Affected: 17.6.1y Affected: 17.6.1z Affected: 17.6.3a Affected: 17.6.4 Affected: 17.6.1z1 Affected: 17.6.5 Affected: 17.6.6 Affected: 17.6.6a Affected: 17.6.5a Affected: 17.7.1 Affected: 17.7.1a Affected: 17.7.1b Affected: 17.7.2 Affected: 17.10.1 Affected: 17.10.1a Affected: 17.10.1b Affected: 17.8.1 Affected: 17.8.1a Affected: 17.9.1 Affected: 17.9.1w Affected: 17.9.2 Affected: 17.9.1a Affected: 17.9.1x Affected: 17.9.1y Affected: 17.9.3 Affected: 17.9.2a Affected: 17.9.1x1 Affected: 17.9.3a Affected: 17.9.4 Affected: 17.9.1y1 Affected: 17.9.4a Affected: 17.11.1 Affected: 17.11.1a Affected: 17.12.1 Affected: 17.12.1w Affected: 17.12.1a Affected: 17.12.2 Affected: 17.12.2a Affected: 17.11.99SW |
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{
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{
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{
"status": "affected",
"version": "3.11.1S"
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"version": "3.11.2S"
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{
"status": "affected",
"version": "3.11.3S"
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{
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"version": "3.11.4S"
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{
"status": "affected",
"version": "3.12.0S"
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"version": "3.16.10S"
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{
"status": "affected",
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{
"status": "affected",
"version": "16.1.3"
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{
"status": "affected",
"version": "16.2.1"
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{
"status": "affected",
"version": "16.2.2"
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{
"status": "affected",
"version": "16.3.1"
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{
"status": "affected",
"version": "16.3.2"
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{
"status": "affected",
"version": "16.3.3"
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{
"status": "affected",
"version": "16.3.1a"
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{
"status": "affected",
"version": "16.3.4"
},
{
"status": "affected",
"version": "16.3.5"
},
{
"status": "affected",
"version": "16.3.5b"
},
{
"status": "affected",
"version": "16.3.6"
},
{
"status": "affected",
"version": "16.3.7"
},
{
"status": "affected",
"version": "16.3.8"
},
{
"status": "affected",
"version": "16.3.9"
},
{
"status": "affected",
"version": "16.3.10"
},
{
"status": "affected",
"version": "16.3.11"
},
{
"status": "affected",
"version": "16.4.1"
},
{
"status": "affected",
"version": "16.4.2"
},
{
"status": "affected",
"version": "16.4.3"
},
{
"status": "affected",
"version": "16.5.1"
},
{
"status": "affected",
"version": "16.5.1a"
},
{
"status": "affected",
"version": "16.5.1b"
},
{
"status": "affected",
"version": "16.5.2"
},
{
"status": "affected",
"version": "16.5.3"
},
{
"status": "affected",
"version": "3.18.0aS"
},
{
"status": "affected",
"version": "3.18.0S"
},
{
"status": "affected",
"version": "3.18.1S"
},
{
"status": "affected",
"version": "3.18.2S"
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
"status": "affected",
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{
"status": "affected",
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{
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{
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
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{
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{
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{
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{
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{
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{
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{
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
"status": "affected",
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{
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{
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{
"status": "affected",
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{
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{
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{
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{
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{
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
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{
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{
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
"version": "16.12.8"
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{
"status": "affected",
"version": "16.12.2s"
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
"version": "16.12.6"
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{
"status": "affected",
"version": "16.12.1z1"
},
{
"status": "affected",
"version": "16.12.5a"
},
{
"status": "affected",
"version": "16.12.5b"
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{
"status": "affected",
"version": "16.12.1z2"
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{
"status": "affected",
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{
"status": "affected",
"version": "16.12.7"
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{
"status": "affected",
"version": "16.12.9"
},
{
"status": "affected",
"version": "16.12.10"
},
{
"status": "affected",
"version": "16.12.10a"
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{
"status": "affected",
"version": "17.1.1"
},
{
"status": "affected",
"version": "17.1.1a"
},
{
"status": "affected",
"version": "17.1.1s"
},
{
"status": "affected",
"version": "17.1.1t"
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{
"status": "affected",
"version": "17.1.3"
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{
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"version": "17.2.1"
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{
"status": "affected",
"version": "17.2.1r"
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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},
{
"status": "affected",
"version": "17.2.3"
},
{
"status": "affected",
"version": "17.3.1"
},
{
"status": "affected",
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},
{
"status": "affected",
"version": "17.3.3"
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{
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{
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"version": "17.3.1w"
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{
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{
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{
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{
"status": "affected",
"version": "17.3.4"
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{
"status": "affected",
"version": "17.3.5"
},
{
"status": "affected",
"version": "17.3.4a"
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{
"status": "affected",
"version": "17.3.6"
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{
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"version": "17.3.4b"
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{
"status": "affected",
"version": "17.3.4c"
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{
"status": "affected",
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{
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{
"status": "affected",
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{
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{
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{
"status": "affected",
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{
"status": "affected",
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{
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{
"status": "affected",
"version": "17.4.1b"
},
{
"status": "affected",
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{
"status": "affected",
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{
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{
"status": "affected",
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{
"status": "affected",
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
"status": "affected",
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},
{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
"version": "17.7.1"
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{
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"version": "17.7.1a"
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{
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{
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{
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{
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{
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{
"status": "affected",
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{
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"version": "17.8.1a"
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{
"status": "affected",
"version": "17.9.1"
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{
"status": "affected",
"version": "17.9.1w"
},
{
"status": "affected",
"version": "17.9.2"
},
{
"status": "affected",
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{
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{
"status": "affected",
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{
"status": "affected",
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{
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},
{
"status": "affected",
"version": "17.9.1x1"
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{
"status": "affected",
"version": "17.9.3a"
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{
"status": "affected",
"version": "17.9.4"
},
{
"status": "affected",
"version": "17.9.1y1"
},
{
"status": "affected",
"version": "17.9.4a"
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{
"status": "affected",
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},
{
"status": "affected",
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{
"status": "affected",
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},
{
"status": "affected",
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},
{
"status": "affected",
"version": "17.12.1a"
},
{
"status": "affected",
"version": "17.12.2"
},
{
"status": "affected",
"version": "17.12.2a"
},
{
"status": "affected",
"version": "17.11.99SW"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in auxiliary asynchronous port (AUX) functions of Cisco IOS XE Software could allow an authenticated, local attacker to cause an affected device to reload or stop responding.\r\n\r This vulnerability is due to the incorrect handling of specific ingress traffic when flow control hardware is enabled on the AUX port. An attacker could exploit this vulnerability by reverse telnetting to the AUX port and sending specific data after connecting. A successful exploit could allow the attacker to cause the device to reset or stop responding, resulting in a denial of service (DoS) condition."
}
],
"exploits": [
{
"lang": "en",
"value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.6,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-828",
"description": "Signal Handler with Functionality that is not Asynchronous-Safe",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-03-27T17:02:19.749Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-aux-333WBz8f",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aux-333WBz8f"
}
],
"source": {
"advisory": "cisco-sa-aux-333WBz8f",
"defects": [
"CSCwh47363"
],
"discovery": "EXTERNAL"
}
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2024-20309",
"datePublished": "2024-03-27T17:02:19.749Z",
"dateReserved": "2023-11-08T15:08:07.631Z",
"dateUpdated": "2024-08-09T18:34:29.824Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
Mitigation
Phases: Implementation, Architecture and Design
Description:
- Eliminate the usage of non-reentrant functionality inside of signal handlers. This includes replacing all non-reentrant library calls with reentrant calls.
- Note: This will not always be possible and may require large portions of the product to be rewritten or even redesigned. Sometimes reentrant-safe library alternatives will not be available. Sometimes non-reentrant interaction between the state of the system and the signal handler will be required by design.
Mitigation
Phase: Implementation
Description:
- Where non-reentrant functionality must be leveraged within a signal handler, be sure to block or mask signals appropriately. This includes blocking other signals within the signal handler itself that may also leverage the functionality. It also includes blocking all signals reliant upon the functionality when it is being accessed or modified by the normal behaviors of the product.
No CAPEC attack patterns related to this CWE.