CVE-2018-11236: gnu glibc Integer Overflow or Wraparound

Vulnerability summary

CVE-2018-11236 is a critical (CVSS 9.8) Integer Overflow or Wraparound vulnerability in gnu glibc. EPSS estimates a 6.92% chance of exploitation in the next 30 days, higher than 94.1% of scored vulnerabilities.

Timeline

1. 18-05-2018
   PublishedVulnerability first disclosed.
2. 05-08-2024
   Last modifiedVulnerability information updated.

Description

stdlib/canonicalize.c in the GNU C Library (aka glibc or libc6) 2.27 and earlier, when processing very long pathname arguments to the realpath function, could encounter an integer overflow on 32-bit architectures, leading to a stack-based buffer overflow and, potentially, arbitrary code execution.

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.