Libssh: missing checks for return values for digests

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Summary

CVECVE-2023-6918
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-12-19 00:15:08 UTC
Updated2026-11-06 14:17:02 UTC
DescriptionA flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends. The return values from these were not properly checked, which could cause low-memory situations failures, NULL dereferences, crashes, or usage of the uninitialized memory as an input for the KDF. In this case, non-matching keys will result in decryption/integrity failures, terminating the connection.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Problem Types: CWE-252 | CWE-252 Unchecked Return Value

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1[email protected]Secondary3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1CNACVSS3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Libssh Libssh All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:0.9.6-14.el8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:0.9.6-14.el8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:0.10.4-13.el9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:0.10.4-13.el9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified

References

ReferenceSourceLinkTags
www.libssh.org/2023/12/18/libssh-0-10-6-and-libssh-0-9-8-security-releases af854a3a-2127-422b-91ae-364da2661108 www.libssh.org Release Notes
access.redhat.com/security/cve/CVE-2023-6918 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Mailing List, Vendor Advisory
bugzilla.redhat.com/show_bug.cgi af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Third Party Advisory
lists.fedoraproject.org/archives/list/[email protected]/messag... af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
security.netapp.com/advisory/ntap-20250214-0009 af854a3a-2127-422b-91ae-364da2661108 security.netapp.com
access.redhat.com/errata/RHSA-2024:3233 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
lists.fedoraproject.org/archives/list/[email protected]/messag... af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
www.libssh.org/security/advisories/CVE-2023-6918.txt af854a3a-2127-422b-91ae-364da2661108 www.libssh.org Vendor Advisory
access.redhat.com/errata/RHSA-2024:2504 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank Jack Weinstein (<[email protected]>) for reporting this issue. (en)

Additional Advisory Data

SourceTimeEvent
CNA2023-12-18T00:00:00.000ZReported to Red Hat.
CNA2023-12-18T00:00:00.000ZMade public.

Workarounds

CNA: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Legacy QID Mappings

  • 200060 Ubuntu Security Notification for libssh Vulnerabilities (USN-6592-1)
  • 200095 Ubuntu Security Notification for libssh Vulnerabilities (USN-6592-2)
  • 285088 Fedora Security Update for libssh (FEDORA-2023-0733306be9)
  • 506112 Alpine Linux Security Update for libssh
  • 6000408 Debian Security Update for libssh (DSA 5591-1)
  • 673335 EulerOS Security Update for libssh (EulerOS-SA-2024-1316)
  • 673381 EulerOS Security Update for libssh (EulerOS-SA-2024-1338)
  • 673472 EulerOS Security Update for libssh (EulerOS-SA-2024-1197)
  • 673750 EulerOS Security Update for libssh (EulerOS-SA-2024-1216)
  • 673785 EulerOS Security Update for libssh (EulerOS-SA-2024-1177)
  • 674082 EulerOS Security Update for libssh (EulerOS-SA-2024-1238)
  • 755620 SUSE Enterprise Linux Security Update for libssh (SUSE-SU-2024:0140-1)
  • 755778 SUSE Enterprise Linux Security Update for libssh (SUSE-SU-2024:0525-1)
  • 755806 SUSE Enterprise Linux Security Update for libssh (SUSE-SU-2024:0539-1)
  • 907721 Common Base Linux Mariner (CBL-Mariner) Security Update for libssh (32199-1)

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