rhsa-2024_0538
Vulnerability from csaf_redhat
Published
2024-01-29 11:50
Modified
2024-11-24 20:56
Summary
Red Hat Security Advisory: libssh security update
Notes
Topic
An update for libssh is now available for Red Hat Enterprise Linux 8.6 Extended Update Support.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.
Security Fix(es):
* libssh: NULL pointer dereference during rekeying with algorithm guessing (CVE-2023-1667)
* libssh: authorization bypass in pki_verify_data_signature (CVE-2023-2283)
* ssh: Prefix truncation attack on Binary Packet Protocol (BPP) (CVE-2023-48795)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"text": "A NULL pointer dereference was found In libssh during re-keying with algorithm guessing. This issue may allow an authenticated client to cause a denial of service.",
"title": "Vulnerability description"
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"text": "libssh: NULL pointer dereference during rekeying with algorithm guessing",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"title": "libssh: NULL pointer dereference during rekeying with algorithm guessing"
},
{
"cve": "CVE-2023-2283",
"cwe": {
"id": "CWE-287",
"name": "Improper Authentication"
},
"discovery_date": "2023-04-26T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2189736"
}
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{
"category": "description",
"text": "A vulnerability was found in libssh, where the authentication check of the connecting client can be bypassed in the`pki_verify_data_signature` function in memory allocation problems. This issue may happen if there is insufficient memory or the memory usage is limited. The problem is caused by the return value `rc,` which is initialized to SSH_ERROR and later rewritten to save the return value of the function call `pki_key_check_hash_compatible.` The value of the variable is not changed between this point and the cryptographic verification. Therefore any error between them calls `goto error` returning SSH_OK.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libssh: authorization bypass in pki_verify_data_signature",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"title": "libssh: authorization bypass in pki_verify_data_signature"
},
{
"cve": "CVE-2023-48795",
"cwe": {
"id": "CWE-222",
"name": "Truncation of Security-relevant Information"
},
"discovery_date": "2023-12-12T00:00:00+00:00",
"ids": [
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"text": "2254210"
}
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{
"category": "description",
"text": "A flaw was found in the SSH channel integrity. By manipulating sequence numbers during the handshake, an attacker can remove the initial messages on the secure channel without causing a MAC failure. For example, an attacker could disable the ping extension and thus disable the new countermeasure in OpenSSH 9.5 against keystroke timing attacks.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "ssh: Prefix truncation attack on Binary Packet Protocol (BPP)",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This CVE is classified as moderate because the attack requires an active Man-in-the-Middle (MITM) who can intercept and modify the connection\u0027s traffic at the TCP/IP layer.\n\nAlthough the attack is cryptographically innovative, its security impact is fortunately quite limited. It only allows the deletion of consecutive messages, and deleting most messages at this protocol stage prevents user authentication from proceeding, leading to a stalled connection.\n\nThe most significant identified impact is that it enables a MITM to delete the SSH2_MSG_EXT_INFO message sent before authentication begins. This allows the attacker to disable a subset of keystroke timing obfuscation features. However, there is no other observable impact on session secrecy or session integrity.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-48795"
},
{
"category": "external",
"summary": "https://access.redhat.com/solutions/7071748",
"url": "https://access.redhat.com/solutions/7071748"
},
{
"category": "external",
"summary": "https://terrapin-attack.com/",
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"release_date": "2023-12-18T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2024-01-29T11:50:44+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nAfter installing these updated packages, all running applications using libssh must be restarted for this update to take effect.",
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{
"category": "workaround",
"details": "Update to the last version and check that client and server provide kex pseudo-algorithms indicating usage of the updated version of the protocol which is protected from the attack. If \"kex-strict-c-v00@openssh.com\" is provided by clients and \"kex-strict-s-v00@openssh.com\" is in the server\u0027s reply, no other steps are necessary.\n\nDisabling ciphers if necessary:\n\nIf \"kex-strict-c-v00@openssh.com\" is not provided by clients or \"kex-strict-s-v00@openssh.com\" is absent in the server\u0027s reply, you can disable the following ciphers and HMACs as a workaround on RHEL-8 and RHEL-9:\n\n1. chacha20-poly1305@openssh.com\n2. hmac-sha2-512-etm@openssh.com\n3. hmac-sha2-256-etm@openssh.com\n4. hmac-sha1-etm@openssh.com\n5. hmac-md5-etm@openssh.com\n\nTo do that through crypto-policies, one can apply a subpolicy with the following content:\n```\ncipher@SSH = -CHACHA20-POLY1305\nssh_etm = 0\n```\ne.g., by putting these lines into `/etc/crypto-policies/policies/modules/CVE-2023-48795.pmod`, applying the resulting subpolicy with `update-crypto-policies --set $(update-crypto-policies --show):CVE-2023-48795` and restarting openssh server.\n\nOne can verify that the changes are in effect by ensuring the ciphers listed above are missing from both `/etc/crypto-policies/back-ends/openssh.config` and `/etc/crypto-policies/back-ends/opensshserver.config`.\n\nFor more details on using crypto-policies, please refer to https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/security_hardening/using-the-system-wide-cryptographic-policies_security-hardening\n\nNote that this procedure does limit the interoperability of the host and is only suggested as a temporary mitigation until the issue is fully resolved with an update.\n\nFor RHEL-7: \nWe can recommend to use strict MACs and Ciphers on RHEL7 in both files /etc/ssh/ssh_config and /etc/ssh/sshd_config.\n\nBelow strict set of Ciphers and MACs can be used as mitigation for RHEL 7.\n\n```\nCiphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com\nMACs umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512\n```\n\n- For Openshift Container Platform 4:\nPlease refer the KCS[1] document for verifying the fix in RHCOS.\n\n[1] https://access.redhat.com/solutions/7071748",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "ssh: Prefix truncation attack on Binary Packet Protocol (BPP)"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.