high
8.6
CWE
125 129 786 823 1285 295
Advisory Published
CVE Published
Updated

CVE-2023-46724: SQUID-2023:4 Denial of Service in SSL Certificate validation

First published: Wed Nov 01 2023(Updated: )

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.

Credit: security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
Squid-Cache Squid>=3.3.0.1<6.4
redhat/squid<6.4
6.4
ubuntu/squid<5.7-0ubuntu0.22.04.2
5.7-0ubuntu0.22.04.2
ubuntu/squid<5.7-1ubuntu3.1
5.7-1ubuntu3.1
ubuntu/squid<6.1-2ubuntu1.1
6.1-2ubuntu1.1
ubuntu/squid<6.1-2ubuntu2
6.1-2ubuntu2
debian/squid<=4.13-10+deb11u2<=5.7-2
4.6-1+deb10u7
4.6-1+deb10u10
4.13-10+deb11u3
5.7-2+deb12u1
6.9-1
>=3.3.0.1<6.4

Remedy

http://www.squid-cache.org/Versions/v5/SQUID-2023_4.patch

Remedy

http://www.squid-cache.org/Versions/v6/SQUID-2023_4.patch

Remedy

https://github.com/squid-cache/squid/commit/b70f864940225dfe69f9f653f948e787f99c3810

Remedy

https://github.com/squid-cache/squid/commit/12b8efc07ff74548d5582c4890f8bdb9057a1bb3

Remedy

https://github.com/squid-cache/squid/commit/792ef23e6e1c05780fe17f733859eef6eb8c8be3

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2023-46724?

    CVE-2023-46724 is a vulnerability in Squid, a caching proxy for the Web, that allows a remote server to cause a Denial of Service by exploiting an Improper Validation of Specified Index bug.

  • Which versions of Squid are affected by CVE-2023-46724?

    Squid versions 3.3.0.1 through 5.9 and 6.0 prior to 6.4 compiled using --with-openssl are affected by CVE-2023-46724.

  • What is the severity of CVE-2023-46724?

    CVE-2023-46724 has a severity rating of 8.6, which is classified as high severity.

  • How can I fix CVE-2023-46724?

    To fix CVE-2023-46724, update Squid to version 6.4 or later. Apply the patch provided by the official Squid-Cache website.

  • Where can I find more information about CVE-2023-46724?

    You can find more information about CVE-2023-46724 on the official Squid-Cache website, as well as the GitHub security advisories and commit pages.

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