From kbeyer@TURBOLINUX.COM Wed Sep 20 00:01:14 2000 From: Kevin Beyer To: BUGTRAQ@SECURITYFOCUS.COM Date: Tue, 19 Sep 2000 13:54:44 -0700 Reply-To: tl-security-announce@www1.turbolinux.com Subject: [BUGTRAQ] [TL-Security-Announce] xchat TLSA2000022-1 ___________________________________________________________________________ TurboLinux Security Announcement Package: xchat-1.4.2 and earlier Date: Monday September 18 19:20 PDT 2000 Affected TurboLinux versions: 6.0.5 and earlier TurboLinux Advisory ID#: TLSA2000022-1 BugTraq ID#: 1601 ___________________________________________________________________________ A security hole was discovered in the package mentioned above. Please update the package in your installation as soon as possible. ___________________________________________________________________________ 1. Problem Summary There has been a well-known vulnerability existing with all un-patched xchat versions 1.4.2 and earlier. By supplying commands enclosed in backticks (``) in URL's sent to X-Chat, it is possible to execute arbitrary commands should the X-Chat user decide to view the link by clicking on it. This is due to the manner in which X-Chat launches pages for viewing. 2. Impact Allows an attacker to exploit shell expansion capabilities to execute commands as the user running Netscape. 3. Thanks Thanks to Zenith Parsec for reporting the security hole to Bugtraq and for updates by Zed, forgive me if I got this wrong. 4. Solution Update the package from our ftp server by running the following command: rpm -Uvh --nodeps --Force ftp_path_to_filename Where ftp_path_to_filename is the following: ftp://ftp.turbolinux.com/pub/updates/6.0/xchat-1.4.3-1.i386.rpm The source RPM can be downloaded here: ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/xchat-1.4.3-1.src.rpm **Note: You must rebuild and install the RPM if you choose to download and install the SRPM. Simply installing the SRPM alone WILL NOT CLOSE THE SECURITY HOLE. Please verify the MD5 checksums of the updates before you install: MD5 sum Package Name --------------------------------------------------------------------------- 56d0f9cfa44ea14d7ad5f21b9f419c17 xchat-1.4.3-1.i386.rpm a6fa049893620723cd48e9925b5a283d xchat-1.4.3-1.src.rpm ___________________________________________________________________________ These packages are GPG signed by Turbolinux for security. Our key is available here: http://www.turbolinux.com/security/tlgpgkey.asc To verify a package, use the following command: rpm --checksig name_of_rpm To examine only the md5sum, use the following command: rpm --checksig --nogpg name_of_rpm **Note: Checking GPG keys requires RPM 3.0 or higher. ___________________________________________________________________________ You can find more updates on our ftp server: ftp://ftp.turbolinux.com/pub/updates/6.0/security/ for TL6.0 Workstation and Server security updates ftp://ftp.turbolinux.com/pub/updates/4.0/security/ for TL4.0 Workstation and Server security updates Our webpage for security announcements: http://www.turbolinux.com/security If you want to report vulnerabilities, please contact: rt-security@turbolinux.com ___________________________________________________________________________ Subscribe to the TurboLinux Security Mailing lists: TL-security - A moderated list for discussing security issues in TurboLinux products. Subscribe at http://www.turbolinux.com/mailman/listinfo/tl-security TL-security-announce - An announce-only mailing list for security updates and alerts. Subscribe at http://www.turbolinux.com/mailman/listinfo/tl-security-announce [Part 2, Application/PGP-SIGNATURE 240bytes] [Unable to print this part]