(Red Hat Issues Fix for Red Hat Linux) EPIC4 Buffer Overflow in Processing CTCP Nicknames May Let Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1008287
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CVE Reference: CAN-2003-0328
(Links to External Site)
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Date: Nov 24 2003
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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): epic4pre2.002, epic4pre2.003 and later versions
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Description: A vulnerability was reported in EPIC4 in the processing of large nicknames. A remote user acting as an IRC server can cause a connected client to crash and potentially execute arbitrary code.
It is reported that an incorrect length calculation in 'ctcp.c' can be triggered by a remote IRC server sending a CTCP request with
a large nickname (greater than approximately 512 bytes), causing EIPC4 to call the alloca() function with a negative value. As
a result, an invalid pointer will be returned and memory contents will be overwritten. A remote user can cause arbitrary code to
be executed with the privileges of the EPIC4 client user, according to the report.
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Impact: A remote IRC server can execute arbitrary code on a connected EPIC4 client system with the privileges of the target EPIC4 client user.
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Solution: Red Hat has released a fix for Red Hat Linux.
Red Hat Linux 7.3:
SRPMS:
ftp://updates.redhat.com/7.3/en/os/SRPMS/epic-1.0.1-15.7.x.src.rpm
i386:
ftp://updates.r
edhat.com/7.3/en/os/i386/epic-1.0.1-15.7.x.i386.rpm
Red Hat Linux 8.0:
SRPMS:
ftp://updates.redhat.com/8.0/en/os/SRPMS/epic-1.0.1-15.8.0.src.rpm
i386:
ftp://up
dates.redhat.com/8.0/en/os/i386/epic-1.0.1-15.8.0.i386.rpm
Red Hat Linux 9:
SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/epic-1.0.1-15.9.src.rpm
i386:
ftp://u
pdates.redhat.com/9/en/os/i386/epic-1.0.1-15.9.i386.rpm
The verification checksums are:
MD5 sum Package
Name
080bb85c470e9c12a15edcd96300e087 7.3/en/os/SRPMS/epic-1.0.1-15.7.x.src.rpm
e8da45cb6a22eb4dc2935de1f5012478 7.3/en/os/i386/epic-1.0.1-15.7.x.i386.rpm
36d4a3832e7a
ad69fb209f23b4e0c4cd 8.0/en/os/SRPMS/epic-1.0.1-15.8.0.src.rpm
cbed1b9694f4205e32a96bf35147e49c 8.0/en/os/i386/epic-1.0.1-15.8.0.i386.rpm
f96a0bc7489d41049aa4c33641afbe
f1 9/en/os/SRPMS/epic-1.0.1-15.9.src.rpm
4e4525b6dafb7d2a8cb728317bf1253c 9/en/os/i386/epic-1.0.1-15.9.i386.rpm
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Vendor URL: www.epicsol.org/ (Links to External Site)
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Cause: Boundary error
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Underlying OS: Linux (Red Hat)
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Underlying OS Comments: 7.3, 8.0, 9
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Reported By: bugzilla@redhat.com
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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, 24 Nov 2003 03:25 -0500
From: bugzilla@redhat.com
Subject: [RHSA-2003:342-01] Updated EPIC packages fix security vulnerability
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
- ---------------------------------------------------------------------
Red Hat Security Advisory
Synopsis: Updated EPIC packages fix security vulnerability
Advisory ID: RHSA-2003:342-01
Issue date: 2003-11-17
Updated on: 2003-11-17
Product: Red Hat Linux
Keywords: irc epic4 ircii
Cross references:
Obsoletes:
CVE Names: CAN-2003-0328
- ---------------------------------------------------------------------
1. Topic:
Updated EPIC packages which fix an exploitable buffer overflow vulnerability
are now available.
2. Relevant releases/architectures:
Red Hat Linux 7.3 - i386
Red Hat Linux 8.0 - i386
Red Hat Linux 9 - i386
3. Problem description:
EPIC (Enhanced Programmable ircII Client) is an advanced ircII chat
client designed to connect to Internet Relay Chat (IRC) servers.
A bug in various versions of EPIC allows remote malicious IRC servers to
cause a denial of service (crash) and execute arbitrary code via a CTCP
request from a large nickname, which causes an incorrect length
calculation. The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the name CAN-2003-0328 to this issue.
Users of EPIC who may connect to untrusted servers are advised to upgrade
to the packages in this erratum which contain a backported security fix to
correct this 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.
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. RPMs required:
Red Hat Linux 7.3:
SRPMS:
ftp://updates.redhat.com/7.3/en/os/SRPMS/epic-1.0.1-15.7.x.src.rpm
i386:
ftp://updates.redhat.com/7.3/en/os/i386/epic-1.0.1-15.7.x.i386.rpm
Red Hat Linux 8.0:
SRPMS:
ftp://updates.redhat.com/8.0/en/os/SRPMS/epic-1.0.1-15.8.0.src.rpm
i386:
ftp://updates.redhat.com/8.0/en/os/i386/epic-1.0.1-15.8.0.i386.rpm
Red Hat Linux 9:
SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/epic-1.0.1-15.9.src.rpm
i386:
ftp://updates.redhat.com/9/en/os/i386/epic-1.0.1-15.9.i386.rpm
6. Verification:
MD5 sum Package Name
- --------------------------------------------------------------------------
080bb85c470e9c12a15edcd96300e087 7.3/en/os/SRPMS/epic-1.0.1-15.7.x.src.rpm
e8da45cb6a22eb4dc2935de1f5012478 7.3/en/os/i386/epic-1.0.1-15.7.x.i386.rpm
36d4a3832e7aad69fb209f23b4e0c4cd 8.0/en/os/SRPMS/epic-1.0.1-15.8.0.src.rpm
cbed1b9694f4205e32a96bf35147e49c 8.0/en/os/i386/epic-1.0.1-15.8.0.i386.rpm
f96a0bc7489d41049aa4c33641afbef1 9/en/os/SRPMS/epic-1.0.1-15.9.src.rpm
4e4525b6dafb7d2a8cb728317bf1253c 9/en/os/i386/epic-1.0.1-15.9.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>
7. References:
ftp://ftp.prbh.org/pub/epic/patches/alloca_underrun-patch-1
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0328
8. 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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