rhsa-2024_2768
Vulnerability from csaf_redhat
Published
2024-05-22 20:40
Modified
2024-11-06 05:48
Summary
Red Hat Security Advisory: Red Hat OpenStack Platform 17.1 (python-paramiko) security update
Notes
Topic
An update for python-paramiko is now available for Red Hat OpenStack
Platform 17.1 (Wallaby).
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
Paramiko, a combination of the esperanto words for paranoid and friend, is
a module for python 2.3 or greater that implements the SSH2 protocol for
secure (encrypted and authenticated) connections to remote machines. Unlike
SSL (aka TLS), the SSH2 protocol does not require heirarchical certificates
signed by a powerful central authority. You may know SSH2 as the protocol
that replaced telnet and rsh for secure access to remote shells, but the
protocol also includes the ability to open arbitrary channels to remote
services across an encrypted tunnel. This is how sftp works, for example.
Security Fix(es):
* 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 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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"notes": [
{
"category": "summary",
"text": "An update for python-paramiko is now available for Red Hat OpenStack\nPlatform 17.1 (Wallaby).\n\nRed Hat Product Security has rated this update as having a security impact\nof Moderate. A Common Vulnerability Scoring System (CVSS) base score, which\ngives a detailed severity rating, is available for each vulnerability from\nthe CVE link(s) in the References section.",
"title": "Topic"
},
{
"category": "general",
"text": "Paramiko, a combination of the esperanto words for paranoid and friend, is\na module for python 2.3 or greater that implements the SSH2 protocol for\nsecure (encrypted and authenticated) connections to remote machines. Unlike\nSSL (aka TLS), the SSH2 protocol does not require heirarchical certificates\nsigned by a powerful central authority. You may know SSH2 as the protocol\nthat replaced telnet and rsh for secure access to remote shells, but the\nprotocol also includes the ability to open arbitrary channels to remote\nservices across an encrypted tunnel. This is how sftp works, for example.\n\nSecurity Fix(es):\n\n* Prefix truncation attack on Binary Packet Protocol (BPP) (CVE-2023-48795)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE\npage listed in the References section.",
"title": "Details"
},
{
"category": "legal_disclaimer",
"text": "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.",
"title": "Terms of Use"
}
],
"publisher": {
"category": "vendor",
"contact_details": "https://access.redhat.com/security/team/contact/",
"issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
"name": "Red Hat Product Security",
"namespace": "https://www.redhat.com"
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"references": [
{
"category": "self",
"summary": "https://access.redhat.com/errata/RHSA-2024:2768",
"url": "https://access.redhat.com/errata/RHSA-2024:2768"
},
{
"category": "external",
"summary": "https://access.redhat.com/security/updates/classification/#moderate",
"url": "https://access.redhat.com/security/updates/classification/#moderate"
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{
"category": "external",
"summary": "2254210",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2254210"
},
{
"category": "self",
"summary": "Canonical URL",
"url": "https://security.access.redhat.com/data/csaf/v2/advisories/2024/rhsa-2024_2768.json"
}
],
"title": "Red Hat Security Advisory: Red Hat OpenStack Platform 17.1 (python-paramiko) security update",
"tracking": {
"current_release_date": "2024-11-06T05:48:49+00:00",
"generator": {
"date": "2024-11-06T05:48:49+00:00",
"engine": {
"name": "Red Hat SDEngine",
"version": "4.1.1"
}
},
"id": "RHSA-2024:2768",
"initial_release_date": "2024-05-22T20:40:08+00:00",
"revision_history": [
{
"date": "2024-05-22T20:40:08+00:00",
"number": "1",
"summary": "Initial version"
},
{
"date": "2024-05-22T20:40:08+00:00",
"number": "2",
"summary": "Last updated version"
},
{
"date": "2024-11-06T05:48:49+00:00",
"number": "3",
"summary": "Last generated version"
}
],
"status": "final",
"version": "3"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_name",
"name": "Red Hat OpenStack Platform 17.1",
"product": {
"name": "Red Hat OpenStack Platform 17.1",
"product_id": "8Base-RHOS-17.1",
"product_identification_helper": {
"cpe": "cpe:/a:redhat:openstack:17.1::el8"
}
}
}
],
"category": "product_family",
"name": "Red Hat OpenStack Platform"
},
{
"branches": [
{
"category": "product_version",
"name": "python-paramiko-0:2.11.0-2.el8ost.src",
"product": {
"name": "python-paramiko-0:2.11.0-2.el8ost.src",
"product_id": "python-paramiko-0:2.11.0-2.el8ost.src",
"product_identification_helper": {
"purl": "pkg:rpm/redhat/python-paramiko@2.11.0-2.el8ost?arch=src"
}
}
}
],
"category": "architecture",
"name": "src"
},
{
"branches": [
{
"category": "product_version",
"name": "python3-paramiko-0:2.11.0-2.el8ost.noarch",
"product": {
"name": "python3-paramiko-0:2.11.0-2.el8ost.noarch",
"product_id": "python3-paramiko-0:2.11.0-2.el8ost.noarch",
"product_identification_helper": {
"purl": "pkg:rpm/redhat/python3-paramiko@2.11.0-2.el8ost?arch=noarch"
}
}
}
],
"category": "architecture",
"name": "noarch"
}
],
"category": "vendor",
"name": "Red Hat"
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],
"relationships": [
{
"category": "default_component_of",
"full_product_name": {
"name": "python-paramiko-0:2.11.0-2.el8ost.src as a component of Red Hat OpenStack Platform 17.1",
"product_id": "8Base-RHOS-17.1:python-paramiko-0:2.11.0-2.el8ost.src"
},
"product_reference": "python-paramiko-0:2.11.0-2.el8ost.src",
"relates_to_product_reference": "8Base-RHOS-17.1"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "python3-paramiko-0:2.11.0-2.el8ost.noarch as a component of Red Hat OpenStack Platform 17.1",
"product_id": "8Base-RHOS-17.1:python3-paramiko-0:2.11.0-2.el8ost.noarch"
},
"product_reference": "python3-paramiko-0:2.11.0-2.el8ost.noarch",
"relates_to_product_reference": "8Base-RHOS-17.1"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2023-48795",
"cwe": {
"id": "CWE-222",
"name": "Truncation of Security-relevant Information"
},
"discovery_date": "2023-12-12T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2254210"
}
],
"notes": [
{
"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"
}
],
"product_status": {
"fixed": [
"8Base-RHOS-17.1:python-paramiko-0:2.11.0-2.el8ost.src",
"8Base-RHOS-17.1:python3-paramiko-0:2.11.0-2.el8ost.noarch"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2023-48795"
},
{
"category": "external",
"summary": "RHBZ#2254210",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2254210"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2023-48795",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-48795"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-48795",
"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/",
"url": "https://terrapin-attack.com/"
}
],
"release_date": "2023-12-18T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2024-05-22T20:40:08+00:00",
"details": "For details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
"product_ids": [
"8Base-RHOS-17.1:python-paramiko-0:2.11.0-2.el8ost.src",
"8Base-RHOS-17.1:python3-paramiko-0:2.11.0-2.el8ost.noarch"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2024:2768"
},
{
"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",
"product_ids": [
"8Base-RHOS-17.1:python-paramiko-0:2.11.0-2.el8ost.src",
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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"
},
"products": [
"8Base-RHOS-17.1:python-paramiko-0:2.11.0-2.el8ost.src",
"8Base-RHOS-17.1:python3-paramiko-0:2.11.0-2.el8ost.noarch"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "ssh: Prefix truncation attack on Binary Packet Protocol (BPP)"
}
]
}
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- 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.