To: BugTraq

Subject: [RHSA-2002:295-07] Updated CUPS packages fix various vulnerabilities

Date: Jan 13 2003 3:36PM

Author:

Message-ID: <200301131536.h0DFa7Z29071@porkchop.devel.redhat.com>





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Red Hat, Inc. Red Hat Security Advisory



Synopsis: Updated CUPS packages fix various vulnerabilities

Advisory ID: RHSA-2002:295-07

Issue date: 2003-01-13

Updated on: 2003-01-09

Product: Red Hat Linux

Keywords:

Cross references:

Obsoletes:

CVE Names: CAN-2002-1366 CAN-2002-1367 CAN-2002-1368 CAN-2002-1369 CAN-2002-1371 CAN-2002-1372

CAN-2002-1383

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1. Topic:



Updated CUPS packages are available for Red Hat Linux 7.3 and 8.0 which fix

various security issues.



2. Relevant releases/architectures:



Red Hat Linux 7.3 - i386

Red Hat Linux 8.0 - i386



3. Problem description:



The Common UNIX Printing System (CUPS) provides a portable printing

layer. A number of vulnerabilities have been discovered in CUPS.



CUPS was distributed with Red Hat Linux 7.3 and 8.0 but is not

installed by default.



1. An integer overflow exists in the CUPS HTTP interface that allows

a local attacker to gain the permissions of the 'lp' user. (CAN-2002-1383)



2. A race condition exists in the creation of a pid file which allows

an attacker who already has privileges of the 'lp' user (for example from

utilizing a different exploit) to create or overwrite any file as

root, leading to arbitrary code execution. (CAN-2002-1366)



3. It is possible to remotely add a printer to CUPS by sending a

specially crafted UDP packet. If an attacker utilizes this vulnerability,

they could add a printer with a tainted name that if clicked on in the

web administration interface could be used to exploit other

vulnerabilities. (CAN-2002-1367)



By utilizing this vulnerability, an attacker could take a number of steps

to be able to get hold of the certificate used to access the administrative

section of the CUPS server and potentially add a printer that will execute

commands with root privileges.



4. Problems with chunked encoding and negative content length handling

in the CUPS HTTP interface can cause CUPS to crash. On Red Hat Linux

platforms this can cause a denial of service (DoS) against CUPS.

(CAN-2002-1368)



5. A number of integer overflows exist in the image handling code of

the filters in CUPS. In addition, CUPS does not properly check for

zero width GIF images. These vulnerabilities allow an attacker who has

the ability to print to run arbitrary code as the 'lp' user. (CAN-2002-1371)



6. An integer overflow exists in the CUPS pdftops filter. This can be

exploited by an attacker who is able to print sending a carefully

crafted PDF file which can execute arbitrary commands as the 'lp' user.

(CAN-2002-1384)



7. A buffer overflow exists in setting up the job management options.

When combined with other vulnerabilities, this could allow a local user

to gain root privileges. This issue only affects the version of CUPS

shipped with Red Hat Linux 7.3. (CAN-2002-1369)



8. A bug in the select() call would allow an easy DoS attack which would

cause CUPS to not recover once the DoS has stopped. (CAN-2002-1372)



Red Hat Linux 7.3 and 8.0 were shipped with versions of CUPS that are

vulnerable to these issues. All users of CUPS are advised to upgrade to the

erratum packages which contain a patch to correct these issue.



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 the

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:



up2date



This will start an interactive process that will result in the appropriate

RPMs being upgraded on your system.



5. RPMs required:



Red Hat Linux 7.3:



SRPMS:

ftp://updates.redhat.com/7.3/en/os/SRPMS/cups-1.1.14-15.2.src.rpm



i386:

ftp://updates.redhat.com/7.3/en/os/i386/cups-1.1.14-15.2.i386.rpm

ftp://updates.redhat.com/7.3/en/os/i386/cups-devel-1.1.14-15.2.i386.rpm

ftp://updates.redhat.com/7.3/en/os/i386/cups-libs-1.1.14-15.2.i386.rpm



Red Hat Linux 8.0:



SRPMS:

ftp://updates.redhat.com/8.0/en/os/SRPMS/cups-1.1.17-0.2.src.rpm



i386:

ftp://updates.redhat.com/8.0/en/os/i386/cups-1.1.17-0.2.i386.rpm

ftp://updates.redhat.com/8.0/en/os/i386/cups-devel-1.1.17-0.2.i386.rpm

ftp://updates.redhat.com/8.0/en/os/i386/cups-libs-1.1.17-0.2.i386.rpm







6. Verification:



MD5 sum Package Name

--------------------------------------------------------------------------

cf0832f7db07adf417d1bd8453bd801d 7.3/en/os/SRPMS/cups-1.1.14-15.2.src.rpm

ae9d1be9adb438ff0243a6bd05a4c469 7.3/en/os/i386/cups-1.1.14-15.2.i386.rpm

2537e97c7935e5cb010544e68dd852b9 7.3/en/os/i386/cups-devel-1.1.14-15.2.i386.rpm

0f019c5ba845f26241058660933dede6 7.3/en/os/i386/cups-libs-1.1.14-15.2.i386.rpm

edab6e2a8ed6f63c97e1ea6c3eae6c76 8.0/en/os/SRPMS/cups-1.1.17-0.2.src.rpm

5161ebc32fa89fe6dedd66497ea0d446 8.0/en/os/i386/cups-1.1.17-0.2.i386.rpm

937776dfef1867760be4fa138162c991 8.0/en/os/i386/cups-devel-1.1.17-0.2.i386.rpm

86ea778316df4691c911d5eaf4ba8444 8.0/en/os/i386/cups-libs-1.1.17-0.2.i386.rpm





These packages are GPG signed by Red Hat, Inc. for security. Our key

is available at http://www.redhat.com/about/contact/pgpkey.html



You can verify each package with the following command:



rpm --checksig -v



If you only wish to verify that each package has not been corrupted or

tampered with, examine only the md5sum with the following command:



md5sum





7. References:



http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1366

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1367

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1368

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1369

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1371

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1372

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1383



8. Contact:



The Red Hat security contact is . More contact

details at http://www.redhat.com/solutions/security/news/contact.html



Copyright 2003 Red Hat, Inc.