CVE-2017-0375 Denial of service in Tor before 0.3.0.8
A remote attacker can cause a denial of service in Tor hidden services by sending a malformed BEGIN cell, crashing the daemon.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-0375?
CVE-2017-0375 is a high-severity denial of service vulnerability in Tor before 0.3.0.8, published on 9 Jun 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The hidden-service feature in Tor before 0.3.0.8 allows a denial of service (assertion failure and daemon exit) in the relay_send_end_cell_from_edge_ function via a malformed BEGIN cell.
Weakness: CWE-617
Which versions are affected by CVE-2017-0375?
It affects 1 product.
Products include Torproject Tor.
How do I fix CVE-2017-0375?
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-2017-0375 being exploited?
There is no known exploitation of CVE-2017-0375 in the wild and no public exploit code.
Other vulnerabilities in Tor before 0.3.0.8
Sources
Also known as GHSA-2mmr-2hq6-5c3v.