CVE-2017-8823 Use after free in Tor before 0.2.5.16, 0.2.6 through 0.2.8 before 0.2.8.17, 0.2.9 before 0.2.9.14, 0.3.0 before 0.3.0.13, and 0.3.1 before 0.3.1.9
A use-after-free in Tor onion services allows attackers to cause denial of service or potentially execute code via mismanaged intro-point expiration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-8823?
CVE-2017-8823 is a high-severity use after free vulnerability in Debian Debian Linux, published on 3 Dec 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Tor before 0.2.5.16, 0.2.6 through 0.2.8 before 0.2.8.17, 0.2.9 before 0.2.9.14, 0.3.0 before 0.3.0.13, and 0.3.1 before 0.3.1.9, there is a use-after-free in onion service v2 during intro-point expiration because the expiring list is mismanaged in certain error cases, aka TROVE-2017-013.
Weakness: CWE-416
Which versions are affected by CVE-2017-8823?
It affects 2 products.
Products include Debian Debian Linux, Tor Project Tor.
How do I fix CVE-2017-8823?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2017-8823 being exploited?
There is no known exploitation of CVE-2017-8823 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2017-8823, GHSA-j544-8gx2-gmf8, UBUNTU-CVE-2017-8823.