CVE-2015-20109: gnu glibc Classic Buffer Overflow

Vulnerability summary

CVE-2015-20109 is a medium (CVSS 5.5) Classic Buffer Overflow vulnerability in gnu glibc. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 23% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 25-06-2023
   PublishedVulnerability first disclosed.
2. 27-11-2024
   Last modifiedVulnerability information updated.

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.

• CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.