[squid-users] [squid-announce] [ADVISORY] SQUID-2021:4 Multiple issues in HTTP Range header

[squid3 at treenet.co.nz]

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Squid Proxy Cache Security Update Advisory SQUID-2021:4
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Advisory ID:       | SQUID-2021:4
Date:              | May 10, 2021
Summary:           | Multiple issues in HTTP Range header
Affected versions: | Squid 2.5 -> 2.7.STABLE9
                    | Squid 3.x -> 3.5.28
                    | Squid 4.x -> 4.14
                    | Squid 5.x -> 5.0.5
Fixed in version:  | Squid 4.16, 5.0.6
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   <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31806>
   <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31807>
   <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31808>
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Problem Description:

  Due to an incorrect input validation bug Squid is vulnerable to
  a Denial of Service attack against all clients using the proxy.

  Due to an incorrect memory management bug Squid is vulnerable to
  a Denial of Service attack against all clients using the proxy.

  Due to an integer overflow bug Squid is vulnerable to a Denial
  of Service attack against all clients using the proxy.

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Severity:

  These problems all allow a trusted client to perform Denial of
  Service when making HTTP Range requests.

  The integer overflow problem allows a remote server to perform
  Denial of Service when delivering responses to HTTP Range
  requests. The issue trigger is a header which can be expected to
  exist in HTTP traffic without any malicious intent.

CVSS Score of 8.0
<https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C/CR:X/IR:X/AR:H/MAV:N/MAC:L/MPR:L/MUI:N/MS:C/MC:X/MI:X/MA:H&version=3.1>

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Updated Packages:

This bug is fixed by Squid versions 4.15 and 5.0.6.

  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-4-e7cf864f938f24eea8af0692c04d16790983c823.patch>

Squid 5:
  
<http://www.squid-cache.org/Versions/v5/changesets/squid-5-6bf66733c122804fada7f5839ef5f3b57e57591c.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 3.5.28 have not been tested and should be
  assumed to be vulnerable.

  All Squid-4.x up to and including 4.14 are vulnerable.

  All Squid-5.x up to and including 5.0.5 are vulnerable.

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Workaround:

  There are no workarounds known for these problems.

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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 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 Joshua Rogers of Opera
  Software.

  Fixed by Alex Rousskov of The Measurement Factory.

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Revision history:

  2021-03-19 06:49:52 UTC Initial Report of Denial of Service
  2021-03-24 08:51:08 UTC Additional Report of Use-After-Free
  2021-03-25 21:57:07 UTC Additional Report of integer-overflow
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END
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