-----BEGIN PGP SIGNED MESSAGE----- [ For Public Release ] __________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN ld.so Vulnerability July 22, 1997 21:00 GMT Number H-86 ______________________________________________________________________________ PROBLEM: A buffer overflow vulnerability exists affecting the ELF and a.out program loaders on Linux. PLATFORM: All platforms running the Linux distributions listed below. DAMAGE: This vulnerability may allow remote users to obtain root access. SOLUTION: Apply patches listed below. ______________________________________________________________________________ VULNERABILITY Exploit details involving this vulnerability have been made ASSESSMENT: publicly available. ______________________________________________________________________________ [ Start Linux-Alert ] ld.so Vulnerability A buffer overflow problem was reported on bugtraq affecting the ELF and a.out program loaders on Linux. This problem can possibly be exploited by malicious users to obtain root access. On Linux, programs linked against shared libraries execute some code contained in /lib/ld.so (for a.out binaries) or /lib/ld-linux.so (for ELF binaries), which loads the shared libraries and binds all symbols. If an error occurs during this stage, an error message is printed and the program terminates. The printf replacement used at this stage is not protected from buffer overruns. David Engel has released a fixed ld.so as ftp://ftp.ods.com/pub/linux/ld.so-1.9.3.tar.gz ftp://i44ftp.info.uni-karlsruhe.de/pub/linux/ld.so/ld.so-1.9.3.tar.gz This release should soon appear on sunsite.unc.edu in /pub/Linux/GCC. Note that ld.so-1.9 does not support the old a.out format anymore. The following Linux distribution maintainers and vendors have released fixed packages of ld.so: - -------------------------------------------------------------------- VENDOR INFORMATION - -------------------------------------------------------------------- Vendor: S.u.S.E Product: S.u.S.E Linux 5.0 Status: Affected, fix available Location: ftp://ftp.suse.com/pub/suse_update/S.u.S.E.-5.0/a1 Files: c7648fbfd29fc56905e1d569f617a811 ld.so-1.9.3.dif c7fba9a7f4040812307841f683ef4abc ld.so-1.9.3.tar.gz 19f71cfc08a69d8ecf1703e5307459a0 ldso.changes fd64cc73f699a2c28a809e1b7b61700e ldso.rpm b3f1350e916381bd7e97c7087fc49535 ldso.tgz Vendor: Caldera Product: Caldera OpenLinux Lite, Base and Standard 1.1 Status: Affected, fix available Location: ftp://ftp.caldera.com/pub/openlinux/updates/1.1/004 Files: 2fed2dd482fe44e020a4bd40fdd2059e ld.so-1.7.14-5.src.rpm 572974e8f777b6da7d67aed15db9c115 ld.so-1.7.14-5.i386.rpm Note: ELF support only. Vendor: RedHat Product: RedHat Linux 4.0, 4.1 and 4.2 Status: Affected, fix available Location: ftp://ftp.redhat.com/updates/4.2 Files: d8883e254021de3058b9c7d3174e9b28 i386/ld.so-1.7.14- 5.i386.rpm 2ab8e35978d81a57a340c81584e78785 sparc/ld.so-sparc-1.8.3- 3.sparc.rpm Note: Files pgp-signed, key available from install CD or PGP key servers. Vendor: Debian Product: Debian GNU/Linux Status: Affected, fix available Location: ftp://ftp.debian.org/debian/bo-updates Files: c044d31c1a7f434837ec648c97481b76 ld.so_1.8.10-2.1.dsc bd6a94d00b6aeb10363b92e4f77a1a30 ld.so_1.8.10-2.1.tar.gz edea24550bf5f5a3c92a4a6319fe60b0 ldso_1.8.10-2.1_i386.deb Vendor: Delix Product: DLD 5.2 Status: Affected, fix available Location: ftp://ftp.delix.de/pub/Linux/DLD-5.2/updates Files: 156f551820e1f7305cf2c19d1cbddc68 *ld.so-1.9.2-3.i386.rpm bbeb99ac166d5c7cfde52346949da363 *ld.so-devel-1.9.2-3.i386.rpm Vendor: LST Product: LST Power Linux 2.2 Status: Affected, fix available Location: Same as for Caldera above. [ End Linux-Alert ] ______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Olaf Kirch for the information contained in this bulletin. ______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 510-422-8193 FAX: +1 510-423-8002 STU-III: +1 510-423-2604 E-mail: ciac@llnl.gov For emergencies and off-hour assistance, DOE, DOE contractor sites, and the NIH may contact CIAC 24-hours a day. During off hours (5PM - 8AM PST), call the CIAC voice number 510-422-8193 and leave a message, or call 800-759-7243 (800-SKY-PAGE) to send a Sky Page. CIAC has two Sky Page PIN numbers, the primary PIN number, 8550070, is for the CIAC duty person, and the secondary PIN number, 8550074 is for the CIAC Project Leader. Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://ciac.llnl.gov/ Anonymous FTP: ciac.llnl.gov (198.128.39.53) Modem access: +1 (510) 423-4753 (28.8K baud) +1 (510) 423-3331 (28.8K baud) CIAC has several self-subscribing mailing lists for electronic publications: 1. CIAC-BULLETIN for Advisories, highest priority - time critical information and Bulletins, important computer security information; 2. CIAC-NOTES for Notes, a collection of computer security articles; 3. SPI-ANNOUNCE for official news about Security Profile Inspector (SPI) software updates, new features, distribution and availability; 4. SPI-NOTES, for discussion of problems and solutions regarding the use of SPI products. Our mailing lists are managed by a public domain software package called Majordomo, which ignores E-mail header subject lines. To subscribe (add yourself) to one of our mailing lists, send the following request as the E-mail message body, substituting ciac-bulletin, ciac-notes, spi-announce OR spi-notes for list-name: E-mail to ciac-listproc@llnl.gov or majordomo@tholia.llnl.gov: subscribe list-name e.g., subscribe ciac-notes You will receive an acknowledgment email immediately with a confirmation that you will need to mail back to the addresses above, as per the instructions in the email. This is a partial protection to make sure you are really the one who asked to be signed up for the list in question. If you include the word 'help' in the body of an email to the above address, it will also send back an information file on how to subscribe/unsubscribe, get past issues of CIAC bulletins via email, etc. PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC) H-77: Microsoft IIS Boundary Condition Vulnerability H-78: ICMP vulnerability in Windows 95 and NT 4.0 H-79: Vellum 3D CD-ROM contains Mac MBDF Virus H-80: SGI IRIX xlock Vulnerability H-42a: HP MPE/iX with ICMP Echo Request (ping) Vulnerability H-81: HP-UX swinstall command in SD-UX Vulnerability H-82: Lynx Temporary Files & Downloading Vulnerabilities H-83: Solaris ping Vulnerability H-84: Windows NT NtOpenProcessToken Vulnerability H-85: INN News Server Vulnerabilities -----BEGIN PGP SIGNATURE----- Version: 4.0 Business Edition iQCVAwUBM9Yj+LnzJzdsy3QZAQFlcgP+Kl9OPQy09bVfJUscIqdab4FlQ42EBFR4 gqxZbTmEvjjUhUWSBRsMOdJXqQtqwQmPbumkxuxEkQ1iKXnhhOjtNok5xvZw+aYF nDvHl65lg2/uexxYwSibyLIkZS+M2X+PRD0FCmfNDlrHmyU0ir4kbYVMv1LGLkFU 7Z1Dp99QiP0= =UTs1 -----END PGP SIGNATURE-----