Due to an input validation bug Squid is vulnerable to a Denial
of Service against all clients using the proxy.
Severity:
This problem allows a remote server to perform Denial of Service
when delivering HTTP Response messages. The issue trigger is a
header which can be expected to exist in HTTP traffic without any
malicious intent by the server.
CVSS Score of 7.9
https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:X/RL:O/RC:C/CR:X/IR:X/AR:H/MAV:N/MAC:L/MPR:N/MUI:R/MS:U/MC:N/MI:N/MA:H&version=3.1
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/SQUID-2021_2.patch
If you are using a prepackaged version of Squid then please refer
to the package vendor for availability information on updated
packages.
Determining if your version is vulnerable:
All Squid older than 4.0 are not 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.
Workaround:
There are no known workarounds for this vulnerability.
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.
Credits:
This vulnerability was discovered by Joshua Rogers of Opera Software.
Fixed by Alex Rousskov of The Measurement Factory.
Revision history:
2021-03-08 19:45:14 UTC Initial Report
2021-03-16 15:45:11 UTC Patch Released
2021-03-18 01:33:50 UTC CVE Allocation
END
Due to an input validation bug Squid is vulnerable to a Denial
of Service against all clients using the proxy.
Severity:
This problem allows a remote server to perform Denial of Service
when delivering HTTP Response messages. The issue trigger is a
header which can be expected to exist in HTTP traffic without any
malicious intent by the server.
CVSS Score of 7.9
https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:X/RL:O/RC:C/CR:X/IR:X/AR:H/MAV:N/MAC:L/MPR:N/MUI:R/MS:U/MC:N/MI:N/MA:H&version=3.1
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/SQUID-2021_2.patch
If you are using a prepackaged version of Squid then please refer
to the package vendor for availability information on updated
packages.
Determining if your version is vulnerable:
All Squid older than 4.0 are not 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.
Workaround:
There are no known workarounds for this vulnerability.
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.
Credits:
This vulnerability was discovered by Joshua Rogers of Opera Software.
Fixed by Alex Rousskov of The Measurement Factory.
Revision history:
2021-03-08 19:45:14 UTC Initial Report
2021-03-16 15:45:11 UTC Patch Released
2021-03-18 01:33:50 UTC CVE Allocation
END