CVE-2020-35679 Denial of service in n/a
Attackers can cause significant memory leaks in OpenSMTPD by sending messages that trigger regex lookups, potentially leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-35679?
CVE-2020-35679 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 24 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
smtpd/table.c in OpenSMTPD before 6.8.0p1 lacks a certain regfree, which might allow attackers to trigger a "very significant" memory leak via messages to an instance that performs many regex lookups.
Weakness: CWE-401
Which versions are affected by CVE-2020-35679?
It affects 2 products.
Products include Fedoraproject Fedora, Opensmtpd Opensmtpd.
How do I fix CVE-2020-35679?
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-2020-35679 being exploited?
There is no known exploitation of CVE-2020-35679 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as ALPINE-CVE-2020-35679, DEBIAN-CVE-2020-35679, GHSA-42p2-4vv3-9qv4, UBUNTU-CVE-2020-35679.