CVE-2019-20394 Use after free in n/a
A double-free vulnerability in libyang allows attackers to cause crashes or execute code via malicious YANG files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2019-20394?
CVE-2019-20394 is a high-severity use after free vulnerability in n/a, published on 22 Jan 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A double-free is present in libyang before v1.0-r3 in the function yyparse() when a type statement in used in a notification statement. Applications that use libyang to parse untrusted input yang files may be vulnerable to this flaw, which would cause a crash or potentially code execution.
Weakness: CWE-415
Which versions are affected by CVE-2019-20394?
It affects 1 product.
Products include Cesnet Libyang.
How do I fix CVE-2019-20394?
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-2019-20394 being exploited?
There is no known exploitation of CVE-2019-20394 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as DEBIAN-CVE-2019-20394, GHSA-pgmh-hmfg-8gwj, UBUNTU-CVE-2019-20394.