NULL pointer dereference in libssh - CVE-2013-0176
Published: February 6, 2013 / Updated: July 28, 2020
Vulnerability identifier: #VU32714
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2013-0176
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error. A remote attacker can trigger denial of service conditions via a "Client: Diffie-Hellman Key Exchange Init" packet.
Affected software
libssh
Ubuntu
Slackware Linux
libssh (Alpine package)
libssh-4 (Ubuntu package)
Ubuntu
Slackware Linux
libssh (Alpine package)
libssh-4 (Ubuntu package)
How to mitigate CVE-2013-0176
Update to version 0.5.4.
libssh - update to 0.5.4
libssh (Alpine package) - update to 0.5.4-r0
libssh-4 (Ubuntu package) - addressed in versions 0.4.2-1ubuntu1.2, 0.5.2-1ubuntu0.11.10.2, 0.5.2-1ubuntu0.12.04.2, 0.5.2-1ubuntu0.12.10.2
libssh (Alpine package) - update to 0.5.4-r0
libssh-4 (Ubuntu package) - addressed in versions 0.4.2-1ubuntu1.2, 0.5.2-1ubuntu0.11.10.2, 0.5.2-1ubuntu0.12.04.2, 0.5.2-1ubuntu0.12.10.2
External References
- http://lists.fedoraproject.org/pipermail/package-announce/2013-February/098065.html
- http://lists.fedoraproject.org/pipermail/package-announce/2013-February/098094.html
- http://secunia.com/advisories/51982
- http://www.libssh.org/2013/01/22/libssh-0-5-4-security-release/
- http://www.ubuntu.com/usn/USN-1707-1
- https://exchange.xforce.ibmcloud.com/vulnerabilities/81595