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Squid Proxy Cache Security Update Advisory SQUID-2019:10
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Advisory ID: SQUID-2019:10
Date: November 05, 2019
Summary: HTTP Request Splitting issue
in HTTP message processing.
Affected versions: Squid 3.0 -> 3.5.28
Squid 4.x -> 4.8
Fixed in version: Squid 4.9
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http://www.squid-cache.org/Advisories/SQUID-2019_10.txt
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18678
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Problem Description:
Due to incorrect message parsing Squid is vulnerable to an HTTP
request splitting issue.
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Severity:
This issue allows attackers to smuggle HTTP requests through
frontend software to a Squid which splits the HTTP Request
pipeline differently. The resulting Response messages corrupt
caches between client and Squid with attacker controlled content
at arbitrary URLs..
Effects are isolated to software between the attacker client and
Squid. There are no effects on Squid itself, nor any upstream
servers.
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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.
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Determining if your version is vulnerable:
All Squid-2.x have not been checked.
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.
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Workarounds:
There are no workarounds for this vulnerability.
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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.
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Credits:
This vulnerability was discovered by by Régis Leroy (regilero
from Makina Corpus).
Fixed by Amos Jeffries of Treehouse Networks Ltd.
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Revision history:
2019-07-24 11:52:51 UTC Initial Report
2019-09-11 02:52:52 UTC Patches Released
2019-11-04 13:43:22 UTC CVE Assignment
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END
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