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CVE-2023-6918

Good to know:

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Date: December 18, 2023

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.

Language: C

Severity Score

Related Resources (10)

https://access.redhat.com/security/cve/CVE-2023-6918
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MKQRBF3DWMWPH36LBCOBUTSIZRTPEZXB/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LZQVUHWVWRH73YBXUQJOD6CKHDQBU3DM/
https://access.redhat.com/errata/RHSA-2024:3233
https://bugzilla.redhat.com/show_bug.cgi?id=2254997
https://www.libssh.org/security/advisories/CVE-2023-6918.txt
https://nvd.nist.gov/vuln/detail/CVE-2023-6918
https://access.redhat.com/errata/RHSA-2024:2504
https://www.libssh.org/2023/12/18/libssh-0-10-6-and-libssh-0-9-8-security-releases/
https://www.mend.io/vulnerability-database/CVE-2023-6918

Severity Score

Weakness Type (CWE)

Unchecked Return Value

CWE-252

Top Fix

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Upgrade to version libssh-0.9.8, libssh-0.10.6

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): LOW

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