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 Software | Affected Version | How to fix |
|---|---|---|
| Squid-Cache Squid | >=3.3.0.1<6.4 | |
| 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 6.6-1 6.9-1 |
| 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 |
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Reference Links
- https://github.com/squid-cache/squid/security/advisories/GHSA-73m6-jm96-c6r3
- https://github.com/squid-cache/squid/commit/b70f864940225dfe69f9f653f948e787f99c3810
- http://www.squid-cache.org/Versions/v5/SQUID-2023_4.patch
- http://www.squid-cache.org/Versions/v6/SQUID-2023_4.patch
- https://security.netapp.com/advisory/ntap-20231208-0001/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MEV66D3PAAY6K7TWDT3WZBLCPLASFJDC/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A5QASTMCUSUEW3UOMKHZJB3FTONWSRXS/
- https://launchpad.net/bugs/cve/CVE-2023-46724
- https://megamansec.github.io/Squid-Security-Audit/ssl-bufferunderread.html
- https://ubuntu.com/security/notices/USN-6500-1
- https://www.cve.org/CVERecord?id=CVE-2023-46724
- https://nvd.nist.gov/vuln/detail/CVE-2023-46724
- https://security-tracker.debian.org/tracker/CVE-2023-46724
- https://github.com/squid-cache/squid/commit/12b8efc07ff74548d5582c4890f8bdb9057a1bb3
- https://github.com/squid-cache/squid/commit/792ef23e6e1c05780fe17f733859eef6eb8c8be3
- https://ubuntu.com/security/CVE-2023-46724
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2250224
- https://access.redhat.com/errata/RHSA-2024:0046
- https://access.redhat.com/errata/RHSA-2024:0072
- https://access.redhat.com/errata/RHSA-2024:0071
- https://access.redhat.com/errata/RHSA-2024:0397
- https://access.redhat.com/errata/RHSA-2024:0772
- https://access.redhat.com/errata/RHSA-2024:0773
- https://access.redhat.com/errata/RHSA-2024:0771
- https://access.redhat.com/errata/RHSA-2024:1153
- https://access.redhat.com/errata/RHSA-2024:1787
- https://bugzilla.redhat.com/show_bug.cgi?id=2247567
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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