NULL pointer dereference in libssh

1) NULL pointer dereference

EUVDB-ID: #VU32714

Risk: Medium

CVSSv4.0: 2.7 [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/E:U/U:Green]

CVE-ID: CVE-2013-0176

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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.

Mitigation

Update to version 0.5.4.

Vulnerable software versions

libssh: 0.5.0 - 0.5.3

CPE2.3

• cpe:2.3:a:libssh:libssh:0.5.0:*:*:*:*:*:*:*
• cpe:2.3:a:libssh:libssh:0.5.1:*:*:*:*:*:*:*
• cpe:2.3:a:libssh:libssh:0.5.2:*:*:*:*:*:*:*

External links

https://lists.fedoraproject.org/pipermail/package-announce/2013-February/098065.html
https://lists.fedoraproject.org/pipermail/package-announce/2013-February/098094.html
https://secunia.com/advisories/51982
https://www.libssh.org/2013/01/22/libssh-0-5-4-security-release/
https://www.ubuntu.com/usn/USN-1707-1
https://exchange.xforce.ibmcloud.com/vulnerabilities/81595

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.