CVE-2015-2929 Denial of service in Tor
Remote servers can cause Tor clients to crash via malformed hidden service descriptors, requiring an upgrade to maintain availability.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2015-2929?
CVE-2015-2929 is a high-severity denial of service vulnerability in The Tor Project Tor, published on 24 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Hidden Service (HS) client implementation in Tor before 0.2.4.27, 0.2.5.x before 0.2.5.12, and 0.2.6.x before 0.2.6.7 allows remote servers to cause a denial of service (assertion failure and application exit) via a malformed HS descriptor.
Which versions are affected by CVE-2015-2929?
It affects 1 product.
Products include Torproject Tor.
How do I fix CVE-2015-2929?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2015-2929 being exploited?
There is no known exploitation of CVE-2015-2929 in the wild and no public exploit code.
Other vulnerabilities in The Tor Project Tor
Sources
Also known as DEBIAN-CVE-2015-2929, GHSA-f7jp-x5vp-978r, UBUNTU-CVE-2015-2929.