Articles / Red Hat: New squid packages…

Red Hat: New squid packages available to fix FTP-based DoS

Certain FTP requests could cause the Squid daemon to abort, making it unavailable for a period of seconds. If enough of these requests are sent in a short period of time, the Squid daemon will not be restarted. Fixed packages are available from
                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          New squid packages available to fix FTP-based DoS
Advisory ID:       RHSA-2001:113-03
Issue date:        2001-09-25
Updated on:        2001-10-16
Product:           Red Hat Linux
Keywords:          squid FTP DoS
Cross references:  

1. Topic:

New squid packages are available that fix a potential DoS in Squid's FTP
handling code. It is recommened that squid users update to the fixed

The packages for Red Hat Linux 6.2 also fix the problem described in
RHSA-2001:097-04; it was later discovered that Red Hat Linux 6.2 is
vulnerable to the same problem in accelerator-only mode.

2001-10-22: Packages are now available for Red Hat Linux 7.2.

2. Relevant releases/architectures:

Red Hat Linux 6.2 - alpha, i386, sparc

Red Hat Linux 7.0 - alpha, i386

Red Hat Linux 7.1 - alpha, i386, ia64

Red Hat Linux 7.2 - i386

3. Problem description:

Certain FTP requests could cause the Squid daemon to abort, making it
unavailable for a period of seconds. If enough of these requests are sent
in a short period of time, the Squid daemon will not be restarted.

Thanks go to Vladimir Ivaschenko for bringing this to our attention, and
to Henrik Nordstrom and the Squid team for providing a fix.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directory *only* contains
desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:


This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

5. Bug IDs fixed ( for more info):

53906 - Squid allows all proxy requests in accelerator mode

6. RPMs required:

Red Hat Linux 6.2:





Red Hat Linux 7.0:




Red Hat Linux 7.1:





Red Hat Linux 7.2:



7. Verification:

MD5 sum                           Package Name
92bf7d39e574dad6e6952b6b89851fe5 6.2/en/os/SRPMS/squid-2.3.STABLE4-10.6.2.src.rpm
e693299406aba9b573354fe29e998a29 6.2/en/os/alpha/squid-2.3.STABLE4-10.6.2.alpha.rpm
ca6952e0be177b25d0e90778ab456f6b 6.2/en/os/i386/squid-2.3.STABLE4-10.6.2.i386.rpm
505fbeeaaf873f52a51e8a0a3e5562ae 6.2/en/os/sparc/squid-2.3.STABLE4-10.6.2.sparc.rpm
2006fdfdc57bc09337be92a04583e00d 7.0/en/os/SRPMS/squid-2.3.STABLE4-10.7.0.src.rpm
0784ce226770a50c4f13640b6cc7d01e 7.0/en/os/alpha/squid-2.3.STABLE4-10.7.0.alpha.rpm
a8d303d2743c0703d3bb2c6502488824 7.0/en/os/i386/squid-2.3.STABLE4-10.7.0.i386.rpm
08a518df230a1f9cf17ecbf2a273a4b8 7.1/en/os/SRPMS/squid-2.3.STABLE4-10.7.1.src.rpm
fe4e72902f8aaf5dec0085c91b0b0e0d 7.1/en/os/alpha/squid-2.3.STABLE4-10.7.1.alpha.rpm
c7e2f184cffdd911411aec7908c937d3 7.1/en/os/i386/squid-2.3.STABLE4-10.7.1.i386.rpm
5883320b3d07b2861122e631f59f8b24 7.1/en/os/ia64/squid-2.3.STABLE4-10.7.1.ia64.rpm
1f87ef13481f99b1d4a218f2436b24c1 7.2/en/os/SRPMS/squid-2.4.STABLE1-6.src.rpm
b5f0ca849fcef20c0c05b2bea268520e 7.2/en/os/i386/squid-2.4.STABLE1-6.i386.rpm

These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:

You can verify each package with the following command:
    rpm --checksig  

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    rpm --checksig --nogpg 

8. References:

Copyright(c) 2000, 2001 Red Hat, Inc.

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