Description
Squid is a caching proxy for the Web. Due to an Improper Validation of Specified Index bug, Squid versions 3.3.0.1 through 5.9 and 6.0 prior to 6.4 compiled using `--with-openssl` are vulnerable to a Denial of Service attack against SSL Certificate validation. This problem allows a remote server to perform Denial of Service against Squid Proxy by initiating a TLS Handshake with a specially crafted SSL Certificate in a server certificate chain. This attack is limited to HTTPS and SSL-Bump. This bug is fixed in Squid version 6.4. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives. Those who you use a prepackaged version of Squid should refer to the package vendor for availability information on updated packages.
Remediation
References
Related Vulnerabilities
MediaWiki Allocation of Resources Without Limits or Throttling Vulnerability (CVE-2021-41800)
WebLogic CVE-2016-0700 Vulnerability (CVE-2016-0700)
WordPress Ultimate Member Plugin Cross-Site Request Forgery (CSRF) Vulnerability (CVE-2019-10673)
WordPress Other Vulnerability (CVE-2007-3140)
WordPress Plugin Student Result or Employee Database Security Bypass (1.6.3)