Fwd: [ADVISORY] SQUID-2022:1 Exposure of Sensitive Information in Cache Manager

[Amos Jeffries <squid3 () treenet co nz>]

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    Squid Proxy Cache Security Update Advisory SQUID-2022:1
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Advisory ID:       | SQUID-2022:1
Date:              | September 23, 2022
Summary:           | Exposure of Sensitive Information
                   | in Cache Manager
Affected versions: | Squid 4.15 -> 4.17
                   | Squid 5.0.6 -> 5.6
Fixed in version:  | Squid 5.7
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<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-41317>
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Problem Description:

 Due to inconsistent handling of internal URIs Squid is
 vulnerable to Exposure of Sensitive Information about clients
 using the proxy.

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Severity:

 This problem allows a trusted client to directly access cache
 manager information bypassing the manager ACL protection.

 The available cache manager information contains records of
 internal network structure, client credentials, client identity
 and client traffic behaviour.

CVSS Score of 6.4
<https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:F/RL:X/RC:C/CR:M/IR:X/AR:X/MAV:X/MAC:L/MPR:L/MUI:X/MS:X/MC:H/MI:X/MA:X&version=3.1>

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Updated Packages:

This bug is fixed by Squid version 5.7.

 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-2022_1.patch>

Squid 5:
 <http://www.squid-cache.org/Versions/v5/changesets/SQUID-2022_1.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:

 Squid older than 4.9 are not vulnerable.

 All Squid-4.9 up to and including 4.14 have not been tested, but
 should be assumed to be vulnerable.

 All Squid-4.15 up to and including 4.17 are vulnerable.

 All Squid-5.0.6 up to and including 5.6 are vulnerable.

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Workaround:

  Add the following to squid.conf:

    acl manager url_regex +i ^[^:]+://[^/]+/squid-internal-mgr/

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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 () 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 () 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 Mikhail Evdokimov
 (aka konata).

 Initial fix by Amos Jeffries of Treehouse Networks Ltd.

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Revision history:

 2022-04-17 18:30:52 UTC Initial Report
 2022-08-08 11:01:47 UTC Initial Fix released
 2022-09-23 05:00:00 UTC Advisory Released
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END

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