Squid DoS via Uncontrolled Recursion in HTTP Request (fixed in 6.6)
CVE-2023-50269 Published on December 14, 2023
SQUID-2023:10 Denial of Service in HTTP Request parsing
Squid is a caching proxy for the Web. Due to an Uncontrolled Recursion bug in versions 2.6 through 2.7.STABLE9, versions 3.1 through 5.9, and versions 6.0.1 through 6.5, Squid may be vulnerable to a Denial of Service attack against HTTP Request parsing. This problem allows a remote client to perform Denial of Service attack by sending a large X-Forwarded-For header when the follow_x_forwarded_for feature is configured. This bug is fixed by Squid version 6.6. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives.
Vulnerability Analysis
CVE-2023-50269 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is a Stack Exhaustion Vulnerability?
The product does not properly control the amount of recursion which takes place, consuming excessive resources, such as allocated memory or the program stack.
CVE-2023-50269 has been classified to as a Stack Exhaustion vulnerability or weakness.
Products Associated with CVE-2023-50269
stack.watch emails you whenever new vulnerabilities are published in Squid Cache Squid or Canonical Ubuntu Linux. Just hit a watch button to start following.
Affected Versions
squid-cache squid:- Version >= 2.6, <= 2.7.STABLE9 is affected.
- Version >= 3.1, <= 5.9 is affected.
- Version >= 6.0.1, < 6.6 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.