Skip to main content

Uncontrolled Resource Consumption

CVE-2023-50868

Medium
6.5/10

Summary

The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations. This issue affect dnsjava versions through 3.5.3, knot-resolver through 5.7.0 and 6.0.0a1 through 6.0.5, bind9 version through 9.16.47 , 9.17.0 through 9.18.21 and 9.19.0 through 9.19.19 and dnsmasq version through v2.89.

  • LOW
  • NETWORK
  • NONE
  • UNCHANGED
  • REQUIRED
  • NONE
  • NONE
  • HIGH

CWE-400 - Uncontrolled resource consumption

An uncontrolled resource allocation attack (also known as resource exhaustion attack) triggers unauthorized overconsumption of the limited resources in an application, such as memory, file system storage, database connection pool entries, and CPU. This may lead to denial of service for valid users and degradation of the application's functionality as well as that of the host operating system.

References

Advisory Timeline

  • Published