CVE-2011-2768 Information disclosure in n/a
Remote relays can bypass Tor anonymity by reading TLS certificate chains to identify client entry guards, compromising user privacy.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2011-2768?
CVE-2011-2768 is a medium-severity vulnerability in Tor Tor, published on 23 Dec 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Tor before 0.2.2.34, when configured as a client or bridge, sends a TLS certificate chain as part of an outgoing OR connection, which allows remote relays to bypass intended anonymity properties by reading this chain and then determining the set of entry guards that the client or bridge had selected.
Weakness: CWE-264
Which versions are affected by CVE-2011-2768?
It affects 1 product.
Products include Tor Tor.
How do I fix CVE-2011-2768?
Upgrade to a fixed version.
Is CVE-2011-2768 being exploited?
There is no known exploitation of CVE-2011-2768 in the wild and no public exploit code.
Other vulnerabilities in Tor Tor
- CVE-2010-1676 Memory corruption in n/a
- CVE-2009-0939 Tor before 0.2.0.34 treats incomplete IPv4 addresses as valid, which has unknown impact and attack vectors related to "Spec conformance," as
- CVE-2009-0414 Memory corruption in n/a
- CVE-2008-5398 Information disclosure in n/a
- CVE-2011-2778 Memory corruption in n/a
Sources
Also known as DEBIAN-CVE-2011-2768, GHSA-h978-fv3x-h43g.