CVE-2012-4561

Description

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.

5.0

CVSS

Severity: Medium

CVSS 2.0 •

EPSS 3.71% Top 15%

Vendor Advisory debian.org Vendor Advisory mandriva.com Vendor Advisory ubuntu.com Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory fedoraproject.org Vendor Advisory opensuse.org Vendor Advisory fedoraproject.org Vendor Advisory libssh.org

Affected: n/a n/a

References

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

Frequently Asked Questions

What is the severity of CVE-2012-4561?: CVE-2012-4561 has been scored as a medium severity vulnerability.
How to fix CVE-2012-4561?: To fix CVE-2012-4561, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2012-4561 being actively exploited in the wild?: It is possible that CVE-2012-4561 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~4% probability that this vulnerability will be exploited by malicious actors in the next 30 days.