CVE-2015-20109 Denial of service in n/a
Attackers can cause application crashes in glibc via crafted fnmatch patterns, requiring updates to the GNU C Library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2015-20109?
CVE-2015-20109 is a medium-severity denial of service vulnerability in Gnu Glibc, published on 25 Jun 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
end_pattern (called from internal_fnmatch) in the GNU C Library (aka glibc or libc6) before 2.22 might allow context-dependent attackers to cause a denial of service (application crash), as demonstrated by use of the fnmatch library function with the **(!() pattern. NOTE: this is not the same as CVE-2015-8984; also, some Linux distributions have fixed CVE-2015-8984 but have not fixed this additional fnmatch issue.
Weakness: CWE-120
Which versions are affected by CVE-2015-20109?
It affects 1 product.
Products include Gnu Glibc.
How do I fix CVE-2015-20109?
Apply the vendor's patch.
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-2015-20109 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2015-20109 exists.
Other vulnerabilities in Gnu Glibc
Sources
Also known as DEBIAN-CVE-2015-20109, GHSA-rf48-x9gm-3vx2, UBUNTU-CVE-2015-20109.