Input validation error in Tor - CVE-2011-0491
Published: January 19, 2011 / Updated: August 11, 2020
Vulnerability identifier: #VU45424
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-2011-0491
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_realloc function in Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha does not validate a certain size value during memory allocation, which might allow remote attackers to cause a denial of service (daemon crash) via unspecified vectors, related to "underflow errors."
How to mitigate CVE-2011-0491
Install update from vendor's website.
Sources
- http://archives.seul.org/or/announce/Jan-2011/msg00000.html
- http://blog.torproject.org/blog/tor-02129-released-security-patches
- http://www.securityfocus.com/bid/45953
- https://exchange.xforce.ibmcloud.com/vulnerabilities/64888
- https://gitweb.torproject.org/tor.git/blob/refs/heads/release-0.2.2:/ChangeLog
- https://trac.torproject.org/projects/tor/ticket/2324