CVE-2023-46724
SQUID-2023:4 Denial of Service in SSL Certificate validation
In short
Squid proxy is vulnerable to crashes when processing specially crafted SSL certificates during HTTPS connections. A remote server can exploit this to disable the proxy service.
Technical detail
Improper index validation in Squid's OpenSSL-compiled versions (3.3.0.1–5.9, 6.0–6.3) allows remote attackers to trigger denial of service by sending a malformed SSL certificate chain during TLS handshake. The attack vector requires HTTPS or SSL-Bump mode; exploitation results in proxy crash or unavailability.
Summary generated and translated by AI from the official 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Affected products
squid-cache · squidWant to know if your infrastructure is exposed to this?
Talk to TrueHacking →References
https://github.com/squid-cache/squid/commit/b70f864940225dfe69f9f653f948e787f99c3810https://github.com/squid-cache/squid/security/advisories/GHSA-73m6-jm96-c6r3https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A5QASTMCUSUEW3UOMKHZJB3FTONWSRXS/https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MEV66D3PAAY6K7TWDT3WZBLCPLASFJDC/https://security.netapp.com/advisory/ntap-20231208-0001/http://www.squid-cache.org/Versions/v5/SQUID-2023_4.patchhttp://www.squid-cache.org/Versions/v6/SQUID-2023_4.patch