CVE-2019-8955 Denial of service in n/a
Remote attackers can cause denial of service against Tor clients and relays by exhausting memory in the KIST cell scheduler.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-8955?
CVE-2019-8955 is a high-severity denial of service vulnerability in n/a, published on 21 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients and relays can occur via memory exhaustion in the KIST cell scheduler.
Weakness: CWE-770
Which versions are affected by CVE-2019-8955?
It affects 1 product.
Linux distribution packages (3)
tor SUSE:Package Hub 12 | All versions | 0.3.4.11-bp150.3.6.1 |
tor SUSE:Package Hub 15 | All versions | 0.3.4.11-bp150.3.6.1 |
tor openSUSE:Leap 15.0 | All versions | 0.3.4.11-bp150.3.6.1 |
Products include Torproject Tor.
How do I fix CVE-2019-8955?
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-2019-8955 being exploited?
There is no known exploitation of CVE-2019-8955 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as DEBIAN-CVE-2019-8955, GHSA-h3x5-p32h-w7q2, UBUNTU-CVE-2019-8955, openSUSE-SU-2019:1107-1.