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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@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 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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