CVE-2018-20796 Denial of service in n/a
An attacker can cause a denial of service in applications using glibc via uncontrolled recursion in regular expression processing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-20796?
CVE-2018-20796 is a high-severity denial of service vulnerability in Gnu Glibc, published on 26 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the GNU C Library (aka glibc or libc6) through 2.29, check_dst_limits_calc_pos_1 in posix/regexec.c has Uncontrolled Recursion, as demonstrated by '(\227|)(\\1\\1|t1|\\\2537)+' in grep.
Weakness: CWE-674
Which versions are affected by CVE-2018-20796?
It affects 4 products.
Products include Gnu Glibc, Netapp Cloud Backup, Netapp Ontap Select Deploy Administration Utility, Netapp Steelstore Cloud Integrated Storage.
How do I fix CVE-2018-20796?
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-2018-20796 being exploited?
There is no known exploitation of CVE-2018-20796 in the wild and no public exploit code.
Other vulnerabilities in Gnu Glibc
Sources
Also known as DEBIAN-CVE-2018-20796, GHSA-7x29-5q3f-f4x2, ROOT-OS-DEBIAN-12-CVE-2018-20796, ROOT-OS-DEBIAN-13-CVE-2018-20796, UBUNTU-CVE-2018-20796.