#VU44435 Information disclosure in Tor - CVE-2011-2769

Vulnerability identifier: #VU44435

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2011-2769

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Tor
Client/Desktop applications / Web browsers

Vendor: tor.eff.org

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

Tor before 0.2.2.34, when configured as a bridge, accepts the CREATE and CREATE_FAST values in the Command field of a cell within an OR connection that it initiated, which allows remote relays to enumerate bridges by using these values.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Tor: 0.0.2 - 0.2.2.32

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External links
https://www.debian.org/security/2011/dsa-2331
https://blog.torproject.org/blog/tor-02234-released-security-patches

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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.