(Red Hat Issues Fix for RH Linux) Gaim Contains Multiple Overflows That Let a Remote User Execute Arbitrary Code
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SecurityTracker Alert ID: 1008852 |
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SecurityTracker URL: http://securitytracker.com/id/1008852
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CVE Reference:
CAN-2004-0006, CAN-2004-0007, CAN-2004-0008
(Links to External Site)
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Date: Jan 26 2004
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Impact:
Denial of service via network, Execution of arbitrary code via network, User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 0.75 and prior versions
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Description:
Multiple vulnerabilities were reported in Gaim. A remote user can execute arbitrary code on the target user's system.
Stefan Esser of e-matters GmbH reported 12 vulnerabilities, including stack overflows, heap overflows, and an integer overflow. Some of the vulnerabilities require a man-in-the-middle attack to exploit.
Several of the vulnerabilities were due to buffer overflows in the processing of Yahoo! Messenger protocol.
An integer overflow was reported in the processing of the AIM/Oscar protocol.
A variety of other protocols and functions also contain overflows.
It is reported that two buffer overflows reside in the decoding of octal values in the yahoo_decode() function in
'gaim/src/protocols/yahoo/yahoo.c' [CVE: CAN-2004-0005]. Only version 0.75 is affected.
A remote server can send an HTTP reply header with specially crafted cookie values to trigger an overflow in 'gaim/src/protocols/yahoo/yahoo.c' in the yahoo_web_pending() function [CVE: CAN-2004-0006].
Two buffer overflows in yahoo_login_page_hash() can be triggered by specially crafted values in the Yahoo! login webpage [CVE: CAN-2004-0006].
A remote user can send a Yahoo! Messenger packet containing a specially crafted keyname value to the target server via the Yahoo! server to execute arbitrary code on the target system [CVE: CAN-2004-0006]. The flaw reportedly resides in the yahoo_packet_read() function in 'gaim/src/protocols/yahoo/yahoo.c'.
It is reported that a malicious AIM/Oscar directIM packet can trigger an overflow in the handlehdr_odc() function in 'gaim/src/protocols/oscar/ft.c' [CVE: CAN-2004-0008]. Versions 0.74 and prior are affected.
Two vulnerabilites were reported in the MIME decoding functions of quotedp_decode() in 'gaim/src/util.c' [CVE: CAN-2004-0005]. Only version 0.75 is affected.
The gaim_url_parse() function in 'gaim/src/util.c' reportedly splits URLs into fixed sized buffers [CVE: CAN-2004-0006].
The gaim_markup_extract_info_field() function in 'gaim/src/util.c' contains a stack overflow in several locations [CVE: CAN-2004-0007]. Versions 0.74 and earlier are affected.
A remote user acting as an HTTP proxy server can trigger an overflow in a connected Gaim client when the client is configured to use an HTTP proxy [CVE: CAN-2004-0006]. The flaw resides in the http_canread() function in 'gaim/src/proxy.c'.
The vendor was initially notified regarding the first of the bugs on January 4, 2004.
The original advisory is available at:
http://security.e-matters.de/advisories/012004.html
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Impact:
A remote user can execute arbitrary code on the target system. In some of the vulnerabilities, the remote user must be operating as a malicious server. In some cases, the remote user must invoke a man-in-the-middle attack. In one case, a remote user can simply send a message via the Yahoo! server.
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Solution:
Red Hat has released a fix.
Red Hat Linux 9:
SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/gaim-0.75-0.9.0.src.rpm
i386:
ftp://updates.redhat.com/9/en/os/i386/gaim-0.75-0.9.0.i386.rpm
The verification checksums are:
MD5 sum Package Name
eaf62f33af192f2cb049cc8593f35aae 9/en/os/SRPMS/gaim-0.75-0.9.0.src.rpm
27835ea8b63b3e876ab18c73e8e7fbd6 9/en/os/i386/gaim-0.75-0.9.0.i386.rpm
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Vendor URL: gaim.sourceforge.net/ (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
Linux (Red Hat Linux)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Mon, 26 Jan 2004 12:39 -0500
Subject: [RHSA-2004:032-01] Updated Gaim packages fix various vulnerabiliies
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
- ---------------------------------------------------------------------
Red Hat Security Advisory
Synopsis: Updated Gaim packages fix various vulnerabiliies
Advisory ID: RHSA-2004:032-01
Issue date: 2004-01-19
Updated on: 2004-01-23
Product: Red Hat Linux
Keywords: gaim im
Cross references:
Obsoletes:
CVE Names: CAN-2004-0006 CAN-2004-0007 CAN-2004-0008
- ---------------------------------------------------------------------
1. Topic:
Updated Gaim packages that fix a number of serious vulnerabilities are now
available.
2. Relevant releases/architectures:
Red Hat Linux 9 - i386
3. Problem description:
Gaim is an instant messenger client that can handle multiple protocols.
Stefan Esser audited the Gaim source code and found a number of bugs that
have security implications. Due to the nature of instant messaging many of
these bugs require man-in-the-middle attacks between client and server.
However at least one of the buffer overflows could be exploited by an
attacker sending a carefully-constructed malicious message through a server.
The issues include:
Multiple buffer overflows that affect versions of Gaim 0.75 and earlier.
1) When parsing cookies in a Yahoo web connection, 2) YMSG protocol
overflows parsing the Yahoo login webpage, 3) a YMSG packet overflow, 4)
flaws in the URL parser, and 5) flaws in HTTP Proxy connect. The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name
CAN-2004-0006 to these issues.
A buffer overflow in Gaim 0.74 and earlier in the Extract Info
Field Function used for MSN and YMSG protocol handlers. The Common
Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2004-0007 to this issue.
An integer overflow in Gaim 0.74 and earlier, when allocating
memory for a directIM packet results in heap overflow.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2004-0008 to this issue.
All users of Gaim should upgrade to these erratum packages, which contain
backported security patches correcting these issues.
Red Hat would like to thank Steffan Esser for finding and reporting these
issues and Jacques A. Vidrine for providing initial patches.
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.
If up2date fails to connect to Red Hat Network due to SSL Certificate
Errors, you need to install a version of the up2date client with an updated
certificate. The latest version of up2date is available from the Red Hat
FTP site and may also be downloaded directly from the RHN website:
https://rhn.redhat.com/help/latest-up2date.pxt
5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):
113845 - CAN-2004-0006/7/8 Multiple vulnerabilities in Gaim
6. RPMs required:
Red Hat Linux 9:
SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/gaim-0.75-0.9.0.src.rpm
i386:
ftp://updates.redhat.com/9/en/os/i386/gaim-0.75-0.9.0.i386.rpm
7. Verification:
MD5 sum Package Name
- --------------------------------------------------------------------------
eaf62f33af192f2cb049cc8593f35aae 9/en/os/SRPMS/gaim-0.75-0.9.0.src.rpm
27835ea8b63b3e876ab18c73e8e7fbd6 9/en/os/i386/gaim-0.75-0.9.0.i386.rpm
These packages are GPG signed by Red Hat for security. Our key is
available from https://www.redhat.com/security/keys.html
You can verify each package with the following command:
rpm --checksig -v <filename>
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 <filename>
8. References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0006
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0007
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0008
9. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://www.redhat.com/solutions/security/news/contact.html
Copyright 2003 Red Hat, Inc.
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