CVE-2021-35942: debian debian_linux Integer Overflow or Wraparound

Vulnerability summary

CVE-2021-35942 is a critical (CVSS 9.1) Integer Overflow or Wraparound vulnerability in debian debian_linux. EPSS estimates a 2.75% chance of exploitation in the next 30 days, higher than 86.2% of scored vulnerabilities.

Timeline

1. 22-07-2021
   PublishedVulnerability first disclosed.
2. 14-10-2026
   Last modifiedVulnerability information updated.

Description

The wordexp function in the GNU C Library (aka glibc) through 2.33 may crash or read arbitrary memory in parse_param (in posix/wordexp.c) when called with an untrusted, crafted pattern, potentially resulting in a denial of service or disclosure of information. This occurs because atoi was used but strtoul should have been used to ensure correct calculations.

• 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-704Incorrect Type Conversion or CastThe product does not correctly convert an object, resource, or structure from one type to a different type.