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