Visit our newest sister site!
Hundreds of free aircraft flight manuals
Civilian • Historical • Military • Declassified • FREE!

TUCoPS :: Linux :: General :: ciach086.txt Vulnerability


[ For Public Release ]

                       The U.S. Department of Energy
                    Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___

                             INFORMATION BULLETIN


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 ]


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/ (for a.out binaries) or /lib/ (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 as

This release should soon appear on in /pub/Linux/GCC.
Note that does not support the old a.out format anymore.

The following Linux distribution maintainers and vendors have released
fixed packages of

- --------------------------------------------------------------------
                    VENDOR INFORMATION
- --------------------------------------------------------------------
Vendor:         S.u.S.E
Product:        S.u.S.E Linux 5.0
Status:         Affected, fix available
Files:          c7648fbfd29fc56905e1d569f617a811
                19f71cfc08a69d8ecf1703e5307459a0  ldso.changes
                fd64cc73f699a2c28a809e1b7b61700e  ldso.rpm
                b3f1350e916381bd7e97c7087fc49535  ldso.tgz

Vendor:         Caldera
Product:        Caldera OpenLinux Lite, Base and Standard 1.1
Status:         Affected, fix available
Files:          2fed2dd482fe44e020a4bd40fdd2059e
Note:           ELF support only.

Vendor:         RedHat
Product:        RedHat Linux 4.0, 4.1 and 4.2
Status:         Affected, fix available
Files:          d8883e254021de3058b9c7d3174e9b28  i386/
                2ab8e35978d81a57a340c81584e78785  sparc/
Note:           Files pgp-signed, key available from install CD or
                PGP key servers.

Vendor:         Debian
Product:        Debian GNU/Linux
Status:         Affected, fix available
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
Files:          156f551820e1f7305cf2c19d1cbddc68 *
                bbeb99ac166d5c7cfde52346949da363 *

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

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:
   Anonymous FTP: (
   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
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
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 or
        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

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

Version: 4.0 Business Edition


TUCoPS is optimized to look best in Firefox® on a widescreen monitor (1440x900 or better).
Site design & layout copyright © 1986-2020 AOH