Due to an Uncontrolled Recursion bug, Squid may be vulnerable to
a Denial of Service attack against HTTP Chunked decoder.

Severity:

This problem allows a remote attacker to perform Denial of
Service when sending a crafted chunked encoded HTTP Message.

Updated Packages:

This bug is fixed by Squid version 6.8.

In addition, patches addressing this problem for the stable
releases can be found in our patch archives:

Squid 6:

http://www.squid-cache.org/Versions/v6/SQUID-2024_1.patch

If you are using a prepackaged version of Squid then please refer
to the package vendor for availability information on updated
packages.

Determining if your version is vulnerable:

Squid older than 3.5.27 are not vulnerable.

All Squid 3.5.27 to 4.17 have not been tested and should be
assumed to be vulnerable.

All Squid-5.x up to and including 5.9 are vulnerable.

All Squid-6.x up to and including 6.7 are vulnerable.

Workaround:

There is no workaround for this issue

Contact details for the Squid project:

For installation / upgrade support on binary packaged versions
of Squid: your first point of contact should be your binary
package vendor.

If you install and build Squid from the original Squid sources
then the [email protected] mailing list is your
primary support point. For subscription details see
http://www.squid-cache.org/Support/mailing-lists.html.

For reporting of non-security bugs in the latest STABLE release
the squid bugzilla database should be used
https://bugs.squid-cache.org/.

For reporting of security sensitive bugs send an email to the
[email protected] mailing list. It's a closed
list (though anyone can post) and security related bug reports
are treated in confidence until the impact has been established.

Credits:

This vulnerability was discovered by Joshua Rogers of Opera
Software.

Fixed by The Measurement Factory.

Revision history:

2023-10-12 11:53:02 UTC Initial Report
2023-10-31 11:35:02 UTC Patches Released
2024-03-04 06:27:00 UTC Fixed Version Released

END