#VU33914 Input validation error in libssh - CVE-2012-4561

Vulnerability identifier: #VU33914

Vulnerability 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-2012-4561

CWE-ID: CWE-20

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 non-authenticated attacker to perform service disruption.

The (1) publickey_make_dss, (2) publickey_make_rsa, (3) signature_from_string, (4) ssh_do_sign, and (5) ssh_sign_session_id functions in keys.c in libssh before 0.5.3 free "an invalid pointer on an error path," which might allow remote attackers to cause a denial of service (crash) via unspecified vectors.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libssh: 0.5.0 - 0.5.2

---

External links
https://lists.fedoraproject.org/pipermail/package-announce/2012-November/093313.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-November/093474.html
https://lists.opensuse.org/opensuse-security-announce/2012-12/msg00002.html
https://lists.opensuse.org/opensuse-updates/2012-12/msg00016.html
https://lists.opensuse.org/opensuse-updates/2013-01/msg00021.html
https://www.debian.org/security/2012/dsa-2577
https://www.libssh.org/2012/11/20/libssh-0-5-3-security-release/
https://www.mandriva.com/security/advisories?name=MDVSA-2012:175
https://www.openwall.com/lists/oss-security/2012/11/20/3
https://www.securityfocus.com/bid/56604
https://www.ubuntu.com/usn/USN-1640-1
https://bugzilla.redhat.com/show_bug.cgi?id=871617
https://exchange.xforce.ibmcloud.com/vulnerabilities/80220

---

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.