CWE-400
Uncontrolled Resource Consumption
The product does not properly control the allocation and maintenance of a limited resource.
CVE-2024-1953 (GCVE-0-2024-1953)
Vulnerability from cvelistv5 – Published: 2024-02-29 10:42 – Updated: 2024-08-16 20:58
VLAI
Summary
Mattermost versions 8.1.x before 8.1.9, 9.2.x before 9.2.5, 9.3.0, and 9.4.x before 9.4.2 fail to limit the number of role names requested from the API, allowing an authenticated attacker to cause the server to run out of memory and crash by issuing an unusually large HTTP request.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
9.4.0 , ≤ 9.4.1
(semver)
Affected: 9.3.0 Affected: 9.2.0 , ≤ 9.2.4 (semver) Affected: 8.1.0 , ≤ 8.1.8 (semver) Unaffected: 9.5 Unaffected: 9.4.2 Unaffected: 9.3.1 Unaffected: 9.2.5 Unaffected: 8.1.9 |
Credits
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CVE-2024-20321 (GCVE-0-2024-20321)
Vulnerability from cvelistv5 – Published: 2024-02-28 16:14 – Updated: 2024-08-16 20:12
VLAI
Summary
A vulnerability in the External Border Gateway Protocol (eBGP) implementation of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability exists because eBGP traffic is mapped to a shared hardware rate-limiter queue. An attacker could exploit this vulnerability by sending large amounts of network traffic with certain characteristics through an affected device. A successful exploit could allow the attacker to cause eBGP neighbor sessions to be dropped, leading to a DoS condition in the network.
Severity
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco NX-OS Software |
Affected:
7.0(3)F1(1)
Affected: 7.0(3)F2(1) Affected: 7.0(3)F2(2) Affected: 7.0(3)F3(1) Affected: 7.0(3)F3(2) Affected: 7.0(3)F3(3) Affected: 7.0(3)F3(3a) Affected: 7.0(3)F3(4) Affected: 7.0(3)F3(3c) Affected: 7.0(3)F3(5) Affected: 9.2(1) Affected: 9.2(2) Affected: 9.2(2t) Affected: 9.2(3) Affected: 9.2(4) Affected: 9.2(2v) Affected: 9.3(1) Affected: 9.3(2) Affected: 9.3(3) Affected: 9.3(4) Affected: 9.3(5) Affected: 9.3(6) Affected: 9.3(7) Affected: 9.3(7a) Affected: 9.3(8) Affected: 9.3(9) Affected: 9.3(10) Affected: 9.3(11) Affected: 9.3(12) Affected: 10.1(1) Affected: 10.1(2) Affected: 10.1(2t) Affected: 10.2(1) Affected: 10.2(1q) Affected: 10.2(2) Affected: 10.2(3) Affected: 10.2(3t) Affected: 10.2(4) Affected: 10.2(5) Affected: 10.2(3v) Affected: 10.2(6) Affected: 10.3(1) Affected: 10.3(2) Affected: 10.3(3) Affected: 10.3(99w) Affected: 10.3(99x) Affected: 10.3(4a) Affected: 10.4(1) |
|
| cisco | nx-os |
Affected:
7.0\(3\)f1\(1\)
Affected: 7.0\(3\)f2\(1\) Affected: 7.0\(3\)f2\(2\) Affected: 7.0\(3\)f3\(1\) Affected: 7.0\(3\)f3\(2\) Affected: 7.0\(3\)f3\(3\) Affected: 7.0\(3\)f3\(3a\) Affected: 7.0\(3\)f3\(4\) Affected: 7.0\(3\)f3\(3c\) Affected: 7.0\(3\)f3\(5\) Affected: 9.2\(1\) Affected: 9.2\(2\) Affected: 9.2\(2t\) Affected: 9.2\(3\) Affected: 9.2\(4\) Affected: 9.2\(2v\) Affected: 9.3\(1\) Affected: 9.3\(2\) Affected: 9.3\(3\) Affected: 9.3\(4\) Affected: 9.3\(5\) Affected: 9.3\(6\) Affected: 9.3\(7\) Affected: 9.3\(7a\) Affected: 9.3\(8\) Affected: 9.3\(9\) Affected: 9.3\(10\) Affected: 9.3\(11\) Affected: 9.3\(12\) Affected: 10.1\(1\) Affected: 10.1\(2\) Affected: 10.1\(2t\) Affected: 10.2\(1\) Affected: 10.2\(1q\) Affected: 10.2\(2\) Affected: 10.2\(3\) Affected: 10.2\(3t\) Affected: 10.2\(4\) Affected: 10.2\(5\) Affected: 10.2\(3v\) Affected: 10.2\(6\) Affected: 10.3\(1\) Affected: 10.3\(2\) Affected: 10.3\(3\) Affected: 10.3\(99w\) Affected: 10.3\(99x\) Affected: 10.3\(4a\) Affected: 10.4\(1\) cpe:2.3:o:cisco:nx-os:7.0\(3\)f1\(1\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:7.0\(3\)f2\(1\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:7.0\(3\)f2\(2\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:7.0\(3\)f3\(1\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:7.0\(3\)f3\(2\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:7.0\(3\)f3\(3\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:7.0\(3\)f3\(3a\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:7.0\(3\)f3\(4\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:7.0\(3\)f3\(3c\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:7.0\(3\)f3\(5\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.2\(1\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.2\(2\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.2\(2t\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.2\(3\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.2\(4\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.2\(2v\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.3\(1\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.3\(2\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.3\(3\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.3\(4\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.3\(5\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.3\(6\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.3\(7\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.3\(7a\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.3\(8\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.3\(9\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.3\(10\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.3\(11\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:9.3\(12\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.1\(1\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.1\(2\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.1\(2t\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.2\(1\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.2\(1q\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.2\(2\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.2\(3\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.2\(3t\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.2\(4\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.2\(5\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.2\(3v\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.2\(6\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.3\(1\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.3\(2\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.3\(3\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.3\(99w\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.3\(99x\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.3\(4a\):*:*:*:*:*:*:* cpe:2.3:o:cisco:nx-os:10.4\(1\):*:*:*:*:*:*:* |
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CVE-2024-20344 (GCVE-0-2024-20344)
Vulnerability from cvelistv5 – Published: 2024-02-28 16:16 – Updated: 2024-08-01 21:59
VLAI
Summary
A vulnerability in system resource management in Cisco UCS 6400 and 6500 Series Fabric Interconnects that are in Intersight Managed Mode (IMM) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on the Device Console UI of an affected device.
This vulnerability is due to insufficient rate-limiting of TCP connections to an affected device. An attacker could exploit this vulnerability by sending a high number of TCP packets to the Device Console UI. A successful exploit could allow an attacker to cause the Device Console UI process to crash, resulting in a DoS condition. A manual reload of the fabric interconnect is needed to restore complete functionality.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
Impacted products
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CVE-2024-20351 (GCVE-0-2024-20351)
Vulnerability from cvelistv5 – Published: 2024-10-23 17:09 – Updated: 2024-10-24 15:06
VLAI
Title
Cisco Firepower Threat Defense Software Snort Firewall Denial of Service Vulnerability
Summary
A vulnerability in the TCP/IP traffic handling function of the Snort Detection Engine of Cisco Firepower Threat Defense (FTD) Software and Cisco FirePOWER Services could allow an unauthenticated, remote attacker to cause legitimate network traffic to be dropped, resulting in a denial of service (DoS) condition.
This vulnerability is due to the improper handling of TCP/IP network traffic. An attacker could exploit this vulnerability by sending a large amount of TCP/IP network traffic through the affected device. A successful exploit could allow the attacker to cause the Cisco FTD device to drop network traffic, resulting in a DoS condition. The affected device must be rebooted to resolve the DoS condition.
Severity
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco Firepower Threat Defense Software |
Affected:
6.2.3.14
Affected: 6.4.0.1 Affected: 6.2.3.7 Affected: 6.2.3 Affected: 6.4.0.2 Affected: 6.2.3.9 Affected: 6.2.3.1 Affected: 6.2.3.2 Affected: 6.4.0.5 Affected: 6.2.3.10 Affected: 6.4.0 Affected: 6.4.0.3 Affected: 6.2.3.6 Affected: 6.4.0.4 Affected: 6.2.3.15 Affected: 6.2.3.5 Affected: 6.2.3.4 Affected: 6.2.3.3 Affected: 6.2.3.8 Affected: 6.4.0.6 Affected: 6.2.3.11 Affected: 6.2.3.12 Affected: 6.2.3.13 Affected: 6.4.0.7 Affected: 6.4.0.8 Affected: 6.6.0 Affected: 6.4.0.9 Affected: 6.2.3.16 Affected: 6.6.0.1 Affected: 6.6.1 Affected: 6.4.0.10 Affected: 6.7.0 Affected: 6.4.0.11 Affected: 6.6.3 Affected: 6.7.0.1 Affected: 6.6.4 Affected: 6.4.0.12 Affected: 6.7.0.2 Affected: 7.0.0 Affected: 6.2.3.17 Affected: 7.0.0.1 Affected: 6.6.5 Affected: 7.0.1 Affected: 7.1.0 Affected: 6.4.0.13 Affected: 6.6.5.1 Affected: 6.2.3.18 Affected: 7.0.1.1 Affected: 6.7.0.3 Affected: 6.4.0.14 Affected: 7.1.0.1 Affected: 6.6.5.2 Affected: 7.0.2 Affected: 6.4.0.15 Affected: 7.2.0 Affected: 7.0.2.1 Affected: 7.0.3 Affected: 6.6.7 Affected: 7.1.0.2 Affected: 7.2.0.1 Affected: 7.0.4 Affected: 7.2.1 Affected: 7.0.5 Affected: 6.4.0.16 Affected: 7.3.0 Affected: 7.2.2 Affected: 7.2.3 Affected: 6.6.7.1 Affected: 7.3.1 Affected: 7.1.0.3 Affected: 7.2.4 Affected: 7.0.6 Affected: 7.2.5 Affected: 7.2.4.1 Affected: 7.3.1.1 Affected: 7.4.0 Affected: 6.4.0.17 Affected: 7.0.6.1 Affected: 7.2.5.1 Affected: 7.4.1 Affected: 7.4.1.1 Affected: 6.6.7.2 Affected: 6.4.0.18 Affected: 7.2.5.2 Affected: 7.3.1.2 |
|
| cisco | firepower_threat_defense_software |
Affected:
6.2.3 , ≤ 7.4.1.1
(custom)
cpe:2.3:a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:* |
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CVE-2024-20500 (GCVE-0-2024-20500)
Vulnerability from cvelistv5 – Published: 2024-10-02 18:23 – Updated: 2025-06-04 20:19
VLAI
Summary
A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a DoS condition in the AnyConnect service on an affected device.
This vulnerability is due to insufficient resource management when establishing TLS/SSL sessions. An attacker could exploit this vulnerability by sending a series of crafted TLS/SSL messages to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to stop accepting new connections, preventing new SSL VPN connections from being established. Existing SSL VPN sessions are not impacted.
Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention.
Severity
5.8 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
Impacted products
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CVE-2024-20502 (GCVE-0-2024-20502)
Vulnerability from cvelistv5 – Published: 2024-10-02 18:23 – Updated: 2025-06-04 20:19
VLAI
Summary
A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device.
This vulnerability is due to insufficient resource management while establishing SSL VPN sessions. An attacker could exploit this vulnerability by sending a series of crafted HTTPS requests to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to stop accepting new connections, preventing new SSL VPN connections from being established. Existing SSL VPN sessions are not impacted.
Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention.
Severity
5.8 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
Impacted products
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CVE-2024-20526 (GCVE-0-2024-20526)
Vulnerability from cvelistv5 – Published: 2024-10-23 17:53 – Updated: 2024-10-23 18:41
VLAI
Summary
A vulnerability in the SSH server of Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition for the SSH server of an affected device.
This vulnerability is due to a logic error when an SSH session is established. An attacker could exploit this vulnerability by sending crafted SSH messages to an affected device. A successful exploit could allow the attacker to exhaust available SSH resources on the affected device so that new SSH connections to the device are denied, resulting in a DoS condition. Existing SSH connections to the device would continue to function normally. The device must be rebooted manually to recover. However, user traffic would not be impacted and could be managed using a remote application such as Cisco Adaptive Security Device Manager (ASDM).
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco Adaptive Security Appliance (ASA) Software |
Affected:
9.16.4.67
Affected: 9.16.4.70 Affected: 9.18.4.40 Affected: 9.20.3 |
|
| cisco | adaptive_security_appliance_software |
Affected:
9.16.4.67
Affected: 9.16.4.70 Affected: 9.18.4.40 Affected: 9.20.3 cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* |
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CVE-2024-20672 (GCVE-0-2024-20672)
Vulnerability from cvelistv5 – Published: 2024-01-09 17:56 – Updated: 2025-06-03 14:30
VLAI
Title
.NET Denial of Service Vulnerability
Summary
.NET Denial of Service Vulnerability
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisory |
| https://security.netapp.com/advisory/ntap-2025032… |
Impacted products
Date Public
2024-01-09 08:00
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CVE-2024-20716 (GCVE-0-2024-20716)
Vulnerability from cvelistv5 – Published: 2024-02-15 13:39 – Updated: 2024-08-01 21:59
VLAI
Title
Force high-usage of resources by generating unlimited coupons: Adobe Commerce
Summary
Adobe Commerce versions 2.4.6-p3, 2.4.5-p5, 2.4.4-p6 and earlier are affected by an Uncontrolled Resource Consumption vulnerability that could lead to an application denial-of-service. A high-privileged attacker could leverage this vulnerability to exhaust system resources, causing the application to slow down or crash. Exploitation of this issue does not require user interaction.
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption (CWE-400)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://helpx.adobe.com/security/products/magento… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Adobe | Adobe Commerce |
Affected:
0 , ≤ 2.4.4-p6
(semver)
|
Date Public
2024-02-13 17:00
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CVE-2024-21342 (GCVE-0-2024-21342)
Vulnerability from cvelistv5 – Published: 2024-02-13 18:02 – Updated: 2025-05-03 01:37
VLAI
Title
Windows DNS Client Denial of Service Vulnerability
Summary
Windows DNS Client Denial of Service Vulnerability
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisory |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Windows 11 version 22H2 |
Affected:
10.0.22621.0 , < 10.0.22621.3155
(custom)
|
|
| Microsoft | Windows 11 version 22H3 |
Affected:
10.0.22631.0 , < 10.0.22631.3155
(custom)
|
|
| Microsoft | Windows 11 Version 23H2 |
Affected:
10.0.22631.0 , < 10.0.22631.3155
(custom)
|
|
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) |
Affected:
10.0.25398.0 , < 10.0.25398.709
(custom)
|
Date Public
2024-02-13 08:00
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Mitigation
Phase: Architecture and Design
Description:
- Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended. A strong authentication and access control model will help prevent such attacks from occurring in the first place. The login application should be protected against DoS attacks as much as possible. Limiting the database access, perhaps by caching result sets, can help minimize the resources expended. To further limit the potential for a DoS attack, consider tracking the rate of requests received from users and blocking requests that exceed a defined rate threshold.
Mitigation
Phase: Architecture and Design
Description:
- Mitigation of resource exhaustion attacks requires that the target system either:
- The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
- The second solution is simply difficult to effectively institute -- and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.
- recognizes the attack and denies that user further access for a given amount of time, or
- uniformly throttles all requests in order to make it more difficult to consume resources more quickly than they can again be freed.
Mitigation
Phase: Architecture and Design
Description:
- Ensure that protocols have specific limits of scale placed on them.
Mitigation
Phase: Implementation
Description:
- Ensure that all failures in resource allocation place the system into a safe posture.
CAPEC-147: XML Ping of the Death
An attacker initiates a resource depletion attack where a large number of small XML messages are delivered at a sufficiently rapid rate to cause a denial of service or crash of the target. Transactions such as repetitive SOAP transactions can deplete resources faster than a simple flooding attack because of the additional resources used by the SOAP protocol and the resources necessary to process SOAP messages. The transactions used are immaterial as long as they cause resource utilization on the target. In other words, this is a normal flooding attack augmented by using messages that will require extra processing on the target.
CAPEC-227: Sustained Client Engagement
An adversary attempts to deny legitimate users access to a resource by continually engaging a specific resource in an attempt to keep the resource tied up as long as possible. The adversary's primary goal is not to crash or flood the target, which would alert defenders; rather it is to repeatedly perform actions or abuse algorithmic flaws such that a given resource is tied up and not available to a legitimate user. By carefully crafting a requests that keep the resource engaged through what is seemingly benign requests, legitimate users are limited or completely denied access to the resource.
CAPEC-492: Regular Expression Exponential Blowup
An adversary may execute an attack on a program that uses a poor Regular Expression(Regex) implementation by choosing input that results in an extreme situation for the Regex. A typical extreme situation operates at exponential time compared to the input size. This is due to most implementations using a Nondeterministic Finite Automaton(NFA) state machine to be built by the Regex algorithm since NFA allows backtracking and thus more complex regular expressions.