CVE-2020-11945: canonical ubuntu_linux Integer Overflow or Wraparound

Vulnerability summary

CVE-2020-11945 is a critical (CVSS 9.8) Integer Overflow or Wraparound vulnerability in canonical ubuntu_linux. EPSS estimates a 27.25% chance of exploitation in the next 30 days, higher than 98% of scored vulnerabilities.

Timeline

1. 23-04-2020
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This occurs because the attacker can overflow the nonce reference counter (a short integer). Remote code execution may occur if the pooled token credentials are freed (instead of replayed as valid credentials).

• 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.