__________________________________________________________________
Squid Proxy Cache Security Update Advisory SQUID-2019:11
__________________________________________________________________
Advisory ID: SQUID-2019:11
Date: November 05, 2019
Summary: Information Disclosure issue
in HTTP Digest Authentication.
Affected versions: Squid 2.x -> 2.7.STABLE9
Squid 3.x -> 3.5.28
Squid 4.x -> 4.8
Fixed in version: Squid 4.9
__________________________________________________________________
http://www.squid-cache.org/Advisories/SQUID-2019_11.txt
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18679
__________________________________________________________________
Problem Description:
Due to incorrect data management Squid is vulnerable to a
information disclosure when processing HTTP Digest
Authentication.
__________________________________________________________________
Severity:
Nonce tokens contain the raw byte value of a pointer which sits
within heap memory allocation. This information reduces ASLR
protections and may aid attackers isolating memory areas to
target for remote code execution attacks.
__________________________________________________________________
Updated Packages:
This bug is fixed by Squid version 4.9.
In addition, a patch addressing this problem for the stable
releases can be found in our patch archives:
Squid 4:
<http://www.squid-cache.org/Versions/v4/changesets/squid-4-671ba97abe929156dc4c717ee52ad22fba0f7443.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:
All Squid-2.x up to and including 2.7.STABLE9 are vulnerable.
All Squid-3.x up to and including 3.5.28 are vulnerable.
All Squid-4.x up to and including 4.8 are vulnerable.
__________________________________________________________________
Workarounds:
Either;
Remove 'auth_param digest ...' configuration settings from
squid.conf.
Or,
Build Squid with --disable-auth-digest
__________________________________________________________________
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 your install and build Squid from the original Squid sources
then the squid-users@xxxxxxxxxxxxxxxxxxxxx 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
<http://bugs.squid-cache.org/>.
For reporting of security sensitive bugs send an email to the
squid-bugs@xxxxxxxxxxxxxxxxxxxxx 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 and fixed by David Fifield.
__________________________________________________________________
Revision history:
2019-08-05 06:15:36 UTC Initial Report
2019-10-20 18:59:08 UTC Patches Released
2019-11-04 13:43:22 UTC CVE Assignment
__________________________________________________________________
END
_______________________________________________
squid-announce mailing list
squid-announce@xxxxxxxxxxxxxxxxxxxxx
http://lists.squid-cache.org/listinfo/squid-announce
