Input validation error in Tor - CVE-2012-4922
Published: September 14, 2012 / Updated: August 11, 2020
Vulnerability identifier: #VU43518
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2012-4922
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: tor.eff.org
Affected software:
Tor
Tor
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
The tor_timegm function in common/util.c in Tor before 0.2.2.39, and 0.2.3.x before 0.2.3.22-rc, does not properly validate time values, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a malformed directory object, a different vulnerability than CVE-2012-4419.
How to mitigate CVE-2012-4922
Install update from vendor's website.
Sources
- http://lists.fedoraproject.org/pipermail/package-announce/2012-September/088006.html
- http://lists.opensuse.org/opensuse-updates/2012-10/msg00005.html
- http://openwall.com/lists/oss-security/2012/09/12/5
- http://security.gentoo.org/glsa/glsa-201301-03.xml
- https://gitweb.torproject.org/tor.git/blob/release-0.2.2:/ReleaseNotes
- https://gitweb.torproject.org/tor.git/commit/973c18bf0e84d14d8006a9ae97fde7f7fb97e404
- https://lists.torproject.org/pipermail/tor-talk/2012-September/025501.html
- https://trac.torproject.org/projects/tor/ticket/6811