Vulnerability identifier: #VU32714

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-0176

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libssh
Universal components / Libraries / Libraries used by multiple products

Vendor: libssh

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

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External links
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
http://exchange.xforce.ibmcloud.com/vulnerabilities/81595

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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.