CVE-2021-38385 Denial of service in n/a
Remote attackers can cause a denial of service in Tor by triggering an assertion failure through mishandled signature verification logic.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-38385?
CVE-2021-38385 is a high-severity denial of service vulnerability in n/a, published on 30 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Tor before 0.3.5.16, 0.4.5.10, and 0.4.6.7 mishandles the relationship between batch-signature verification and single-signature verification, leading to a remote assertion failure, aka TROVE-2021-007.
Weakness: CWE-617
Which versions are affected by CVE-2021-38385?
It affects 1 product.
Linux distribution packages (4)
tor SUSE:Package Hub 15 SP2 | All versions | 0.4.6.7-bp152.2.15.1 |
tor SUSE:Package Hub 15 SP3 | All versions | 0.4.6.7-bp153.2.6.1 |
tor openSUSE:Leap 15.2 | All versions | 0.4.6.7-lp152.2.15.1 |
tor openSUSE:Leap 15.3 | All versions | 0.4.6.7-bp153.2.6.1 |
Products include Torproject Tor.
How do I fix CVE-2021-38385?
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-2021-38385 being exploited?
There is no known exploitation of CVE-2021-38385 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as DEBIAN-CVE-2021-38385, DSA-4961-1, GHSA-jh9r-c248-cvw6, MGASA-2021-0426, UBUNTU-CVE-2021-38385, openSUSE-SU-2021:1169-1 and 2 more.