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[squid-announce] [ADVISORY] SQUID-2020:11 HTTP Request Smuggling

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    Squid Proxy Cache Security Update Advisory SQUID-2020:11
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Advisory ID:       | SQUID-2020:11
Date:              | Oct 4, 2020
Summary:           | HTTP Request Smuggling
Affected versions: | Squid 2.x -> 2.7.STABLE9
                   | Squid 3.x -> 3.5.28
                   | Squid 4.x -> 4.13
                   | Squid 5.x -> 5.0.4
Fixed in version:  | Squid 4.14 and 5.0.5
__________________________________________________________________

  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25097>
__________________________________________________________________

Problem Description:

 Due to improper input validation Squid is vulnerable to an HTTP
 Request Smuggling attack.

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Severity:

 This problem allows a trusted client to perform HTTP Request
 Smuggling and access services otherwise forbidden by Squid
 security controls.

CVSS Score of 9.3
<https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:F/RL:O/RC:C/CR:H/IR:X/AR:X/MAV:N/MAC:L/MPR:N/MUI:N/MS:C/MC:H/MI:X/MA:X&version=3.1>

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Updated Packages:

 This bug is fixed by Squid versions 4.14 and 5.0.5.

 In addition, patches 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-2020_11.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 with squid.conf containing "uri_whitespace deny" are
 not vulnerable.

 All Squid with squid.conf containing "uri_whitespace encode" are
 not vulnerable.

 All Squid-4.x up to and including 4.13 without uri_whitespace in
 squid.conf are vulnerable.

 All Squid-4.x up to and including 4.13 with uri_whitespace in
 squid.conf configured to "allow" are vulnerable.

 All Squid-4.x up to and including 4.13 with uri_whitespace in
 squid.conf configured to "chop" are vulnerable.

 All Squid-4.x up to and including 4.13 with uri_whitespace in
 squid.conf configured to "strip" are vulnerable.

 All Squid-5.x up to and including 5.0.4 without uri_whitespace
 in squid.conf are vulnerable.

 All Squid-5.x up to and including 5.0.4 with uri_whitespace in
 squid.conf configured to "allow" are vulnerable.

 All Squid-5.x up to and including 5.0.4 with uri_whitespace in
 squid.conf configured to "chop" are vulnerable.

 All Squid-5.x up to and including 5.0.4 with uri_whitespace in
 squid.conf configured to "strip" are vulnerable.

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Workaround:

Either,

  Configure squid.conf with uri_whitespace deny

Or,

  Configure squid.conf with uri_whitespace encode

__________________________________________________________________

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 <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 by Jianjun Chen from ICSI,
 Berkeley.

 Fixed by Amos Jeffries of Treehouse Networks Ltd and
 Alex Rousskov of The Measurement Factory.

__________________________________________________________________

Revision history:

 2020-09-01 03:58:36 UTC Initial Report
 2020-09-03 03:03:24 UTC CVE Allocation
 2020-09-04 04:38:30 UTC Patches released
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END
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