[squid-announce] [ADVISORY] SQUID-2019:10 HTTP Request Splitting issue in HTTP message processing

[Amos Jeffries]

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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 at lists.squid-cache.org 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 at lists.squid-cache.org 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