Libssh: missing checks for return values for digests
CVE-2023-6918

5.3MEDIUM

Key Information:

Vendor
Red Hat
Status
libssh
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
19 December 2023

Summary

A 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.

Affected Version(s)

libssh 0.9.8

libssh 0.10.6

References

https://access.redhat.com/security/cve/CVE-2023-6918
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2254997
issue-trackingx_refsource_REDHAT
https://lists.fedoraproject.org/archives/list/package-ann...

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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