#VU45427 Heap-based buffer overflow in Tor - CVE-2011-0427

Vulnerability identifier: #VU45427

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2011-0427

CWE-ID: CWE-122

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Tor
Client/Desktop applications / Web browsers

Vendor: tor.eff.org

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in Heap-based buffer overflow in Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha. A remote attacker can use unspecified vectors. to trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Tor: 0.0.2 - 0.2.2.20

---

External links
https://archives.seul.org/or/announce/Jan-2011/msg00000.html
https://blog.torproject.org/blog/tor-02129-released-security-patches
https://secunia.com/advisories/42905
https://secunia.com/advisories/42907
https://www.debian.org/security/2011/dsa-2148
https://www.securityfocus.com/bid/45832
https://www.securitytracker.com/id?1024980
https://www.vupen.com/english/advisories/2011/0131
https://www.vupen.com/english/advisories/2011/0132
https://exchange.xforce.ibmcloud.com/vulnerabilities/64748
https://gitweb.torproject.org/tor.git/blob/refs/heads/release-0.2.2:/ChangeLog

---

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.