CVE-2023-6918

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
3.7 LOW
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 58%
Affected Products (NVD)
VendorProductVersion
libsshlibssh
0.9.0 ≤
𝑥
< 0.9.8
libsshlibssh
0.10.0 ≤
𝑥
< 0.10.6
redhatenterprise_linux
8.0
redhatenterprise_linux
9.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
libssh
bookworm
0.10.6-0+deb12u1
fixed
bookworm (security)
0.10.6-0+deb12u1
fixed
bullseye
0.9.8-0+deb11u1
fixed
bullseye (security)
0.9.8-0+deb11u1
fixed
sid
0.11.1-1
fixed
trixie
0.11.1-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
libssh
bionic
Fixed 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm3
released
focal
Fixed 0.9.3-2ubuntu2.5
released
jammy
Fixed 0.9.6-2ubuntu0.22.04.3
released
lunar
Fixed 0.10.4-2ubuntu0.3
released
mantic
Fixed 0.10.5-3ubuntu1.2
released
trusty
ignored
xenial
Fixed 0.6.3-4.3ubuntu0.6+esm1
released
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
libssh-config
suse enterprise desktop 15 SP5
0.9.8-150400.3.3.1
fixed
suse enterprise desktop 15 SP6
0.9.8-150600.9.1
fixed
suse enterprise desktop 15 SP7
0.9.8-150600.9.1
fixed
suse enterprise sap 15 SP2
0.9.8-150200.13.3.1
fixed
suse enterprise sap 15 SP3
0.9.8-150200.13.3.1
fixed
suse enterprise sap 15 SP5
0.9.8-150400.3.3.1
fixed
suse enterprise sap 15 SP6
0.9.8-150600.9.1
fixed
suse enterprise sap 15 SP7
0.9.8-150600.9.1
fixed
suse enterprise server 15 SP2
0.9.8-150200.13.3.1
fixed
suse enterprise server 15 SP3
0.9.8-150200.13.3.1
fixed
suse enterprise server 15 SP4
0.9.8-150400.3.3.1
fixed
suse enterprise server 15 SP5
0.9.8-150400.3.3.1
fixed
suse enterprise server 15 SP6
0.9.8-150600.9.1
fixed
suse enterprise server 15 SP7
0.9.8-150600.9.1
fixed
libssh-devel
suse enterprise desktop 15 SP5
0.9.8-150400.3.3.1
fixed
suse enterprise desktop 15 SP6
0.9.8-150600.9.1
fixed
suse enterprise desktop 15 SP7
0.9.8-150600.9.1
fixed
suse enterprise sap 15 SP2
0.9.8-150200.13.3.1
fixed
suse enterprise sap 15 SP3
0.9.8-150200.13.3.1
fixed
suse enterprise sap 15 SP5
0.9.8-150400.3.3.1
fixed
suse enterprise sap 15 SP6
0.9.8-150600.9.1
fixed
suse enterprise sap 15 SP7
0.9.8-150600.9.1
fixed
suse enterprise server 15 SP2
0.9.8-150200.13.3.1
fixed
suse enterprise server 15 SP3
0.9.8-150200.13.3.1
fixed
suse enterprise server 15 SP4
0.9.8-150400.3.3.1
fixed
suse enterprise server 15 SP5
0.9.8-150400.3.3.1
fixed
suse enterprise server 15 SP6
0.9.8-150600.9.1
fixed
suse enterprise server 15 SP7
0.9.8-150600.9.1
fixed
libssh4
suse enterprise desktop 15 SP5
0.9.8-150400.3.3.1
fixed
suse enterprise desktop 15 SP6
0.9.8-150600.9.1
fixed
suse enterprise desktop 15 SP7
0.9.8-150600.9.1
fixed
suse enterprise sap 15 SP2
0.9.8-150200.13.3.1
fixed
suse enterprise sap 15 SP3
0.9.8-150200.13.3.1
fixed
suse enterprise sap 15 SP5
0.9.8-150400.3.3.1
fixed
suse enterprise sap 15 SP6
0.9.8-150600.9.1
fixed
suse enterprise sap 15 SP7
0.9.8-150600.9.1
fixed
suse enterprise server 15 SP2
0.9.8-150200.13.3.1
fixed
suse enterprise server 15 SP3
0.9.8-150200.13.3.1
fixed
suse enterprise server 15 SP4
0.9.8-150400.3.3.1
fixed
suse enterprise server 15 SP5
0.9.8-150400.3.3.1
fixed
suse enterprise server 15 SP6
0.9.8-150600.9.1
fixed
suse enterprise server 15 SP7
0.9.8-150600.9.1
fixed
libssh4-32bit
suse enterprise desktop 15 SP5
0.9.8-150400.3.3.1
fixed
suse enterprise desktop 15 SP6
0.9.8-150600.9.1
fixed
suse enterprise desktop 15 SP7
0.9.8-150600.9.1
fixed
suse enterprise sap 15 SP2
0.9.8-150200.13.3.1
fixed
suse enterprise sap 15 SP3
0.9.8-150200.13.3.1
fixed
suse enterprise sap 15 SP5
0.9.8-150400.3.3.1
fixed
suse enterprise sap 15 SP6
0.9.8-150600.9.1
fixed
suse enterprise sap 15 SP7
0.9.8-150600.9.1
fixed
suse enterprise server 15 SP2
0.9.8-150200.13.3.1
fixed
suse enterprise server 15 SP3
0.9.8-150200.13.3.1
fixed
suse enterprise server 15 SP4
0.9.8-150400.3.3.1
fixed
suse enterprise server 15 SP5
0.9.8-150400.3.3.1
fixed
suse enterprise server 15 SP6
0.9.8-150600.9.1
fixed
suse enterprise server 15 SP7
0.9.8-150600.9.1
fixed
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
libssh
RHEL 8
0:0.9.6-14.el8
fixed
RHEL 9
0:0.10.4-13.el9
fixed
libssh-config
RHEL 8
0:0.9.6-14.el8
fixed
RHEL 9
0:0.10.4-13.el9
fixed
libssh-devel
RHEL 8
0:0.9.6-14.el8
fixed
RHEL 9
0:0.10.4-13.el9
fixed
Common Weakness Enumeration
References
https://access.redhat.com/errata/RHSA-2024:2504
https://access.redhat.com/errata/RHSA-2024:3233
https://access.redhat.com/security/cve/CVE-2023-6918
https://bugzilla.redhat.com/show_bug.cgi?id=2254997
https://www.libssh.org/2023/12/18/libssh-0-10-6-and-libssh-0-9-8-security-releases/
https://www.libssh.org/security/advisories/CVE-2023-6918.txt
https://access.redhat.com/errata/RHSA-2024:2504
https://access.redhat.com/errata/RHSA-2024:3233
https://access.redhat.com/security/cve/CVE-2023-6918
https://bugzilla.redhat.com/show_bug.cgi?id=2254997
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LZQVUHWVWRH73YBXUQJOD6CKHDQBU3DM/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MKQRBF3DWMWPH36LBCOBUTSIZRTPEZXB/
https://security.netapp.com/advisory/ntap-20250214-0009/
https://www.libssh.org/2023/12/18/libssh-0-10-6-and-libssh-0-9-8-security-releases/
https://www.libssh.org/security/advisories/CVE-2023-6918.txt