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Date: Fri, 23 Sep 2022 17:00:16 +1200
From: Amos Jeffries <>
Subject: Fwd: [ADVISORY] SQUID-2022:1 Exposure of Sensitive Information in
 Cache Manager


     Squid Proxy Cache Security Update Advisory SQUID-2022:1

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


Problem Description:

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



  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


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:

Squid 5:

  If you are using a prepackaged version of Squid then please refer
  to the package vendor for availability information on updated


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.



   Add the following to squid.conf:

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


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 <> mailing list is your
  primary support point. For subscription details see

  For reporting of non-security bugs in the latest STABLE release
  the squid bugzilla database should be used

  For reporting of security sensitive bugs send an email to the
  <> 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.



  This vulnerability was discovered by Mikhail Evdokimov
  (aka konata).

  Initial fix by Amos Jeffries of Treehouse Networks Ltd.


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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