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Home » Security Advisories» Red Hat » Squid NTLM denial of service

Squid NTLM denial of service

A denial of service flaw was found in the way squid processes certain NTLM authentication requests. It is possible for a remote attacker to crash the Squid server by sending a specially crafted NTLM authentication request.

  • Vendor: Red Hat
  • Vendor ID: RHSA-2006:0052-01
  • Date: March 07, 2006


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Red Hat Security Advisory

Synopsis: Moderate: squid security update
Advisory ID: RHSA-2006:0052-01
Advisory URL: https://rhn.redhat.com/errata/RHSA-2006-0052.html
Issue date: 2006-03-07
Updated on: 2006-03-07
Product: Red Hat Enterprise Linux
CVE Names: CVE-2005-2917
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1. Summary:

An updated squid package that fixes a security vulnerability as well as
several issues is now available.

This update has been rated as having moderate security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux Desktop version 4 - i386, x86_64
Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64

3. Problem description:

Squid is a high-performance proxy caching server for Web clients,
supporting FTP, gopher, and HTTP data objects.

A denial of service flaw was found in the way squid processes certain NTLM
authentication requests. It is possible for a remote attacker to crash the
Squid server by sending a specially crafted NTLM authentication request.
The Common Vulnerabilities and Exposures project (cve.mitre.org) assigned
the name CVE-2005-2917 to this issue.

The following issues have also been fixed in this update:

* An error introduced in squid-2.5.STABLE6-3.4E.12 can crash Squid when a
user visits a site that has a bit longer DNS record.

* An error introduced in the old package prevented Squid from returning
correct information about large file systems. The new package is compiled
with the IDENT lookup support so that users who want to use it do not
have to recompile it.

* Some authentication helpers needed SETUID rights but did not have them.
If administrators wanted to use cache administrator, they had to change
the SETUID bit manually. The updated package sets this bit so the new
package can be updated without manual intervention from administrators.

* Squid could not handle a reply from an HTTP server when the reply began
with the new-line character.

* An issue was discovered when a reply from an HTTP server was not
HTTP 1.0 or 1.1 compliant.

* The updated package keeps user-defined error pages when the package
is updated and it adds new ones.

All users of squid should upgrade to this updated package, which resolves
these issues.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied. Use Red Hat
Network to download and update your packages. To launch the Red Hat
Update Agent, use the following command:

up2date

For information on how to install packages manually, refer to the
following Web page for the System Administration or Customization
guide specific to your system:

http://www.redhat.com/docs/manuals/enterprise/

5. Bug IDs fixed (http://bugzilla.redhat.com/):

160704 - squid child processes exit with signal 6.. squid crashes
162660 - pam authentication fails
168378 - CVE-2005-2917 Squid malformed NTLM authentication DoS
170399 - Squid blocks page served by broken server
172375 - Error pages should not be replaced by updates
172392 - One translated Polish language error is missing preventing squid from startup
172697 - Squid doesn't handle headers split across packets


6. RPMs required:

Red Hat Enterprise Linux AS version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/squid-2.5.STABLE6-3.4E.12.src.rpm
9fe34dfe64e9ee9c41e3bc7d1045a322 squid-2.5.STABLE6-3.4E.12.src.rpm

i386:
6723c05cd3f3e4820202ccb7ef36d87f squid-2.5.STABLE6-3.4E.12.i386.rpm

ia64:
e94cb0ab3f6cb32211daaa7fcc990d60 squid-2.5.STABLE6-3.4E.12.ia64.rpm

ppc:
0fbfee738f1c6fb25b35f2f5ed5dda91 squid-2.5.STABLE6-3.4E.12.ppc.rpm

s390:
558e14fde06db116b71eefbe260acbd4 squid-2.5.STABLE6-3.4E.12.s390.rpm

s390x:
178d3cc52c236dece99bbb487e741f6a squid-2.5.STABLE6-3.4E.12.s390x.rpm

x86_64:
b830bea5e588962f2d47fe20870c99ef squid-2.5.STABLE6-3.4E.12.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/squid-2.5.STABLE6-3.4E.12.src.rpm
9fe34dfe64e9ee9c41e3bc7d1045a322 squid-2.5.STABLE6-3.4E.12.src.rpm

i386:
6723c05cd3f3e4820202ccb7ef36d87f squid-2.5.STABLE6-3.4E.12.i386.rpm

x86_64:
b830bea5e588962f2d47fe20870c99ef squid-2.5.STABLE6-3.4E.12.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/squid-2.5.STABLE6-3.4E.12.src.rpm
9fe34dfe64e9ee9c41e3bc7d1045a322 squid-2.5.STABLE6-3.4E.12.src.rpm

i386:
6723c05cd3f3e4820202ccb7ef36d87f squid-2.5.STABLE6-3.4E.12.i386.rpm

ia64:
e94cb0ab3f6cb32211daaa7fcc990d60 squid-2.5.STABLE6-3.4E.12.ia64.rpm

x86_64:
b830bea5e588962f2d47fe20870c99ef squid-2.5.STABLE6-3.4E.12.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/squid-2.5.STABLE6-3.4E.12.src.rpm
9fe34dfe64e9ee9c41e3bc7d1045a322 squid-2.5.STABLE6-3.4E.12.src.rpm

i386:
6723c05cd3f3e4820202ccb7ef36d87f squid-2.5.STABLE6-3.4E.12.i386.rpm

ia64:
e94cb0ab3f6cb32211daaa7fcc990d60 squid-2.5.STABLE6-3.4E.12.ia64.rpm

x86_64:
b830bea5e588962f2d47fe20870c99ef squid-2.5.STABLE6-3.4E.12.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-2917

8. Contact:

The Red Hat security contact is . More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2006 Red Hat, Inc.
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