ld.so fails to unset LD_PRELOAD before executing suid root programs

Overview

ld.so fails to unset LD_PRELOAD before executing suid root programs, allowing loading of insecure or malicious libraries.

Description

ld.so, the UNIX/LINUX dynamic loader, fails in some conditions (and some operating system releases) to unset LD_PRELOAD before loading suid root programs for execution. Even though setuid root programs ignore LD_PRELOAD, programs called from suid root programs would use LD_PRELOAD and be loaded with insecure or malicious libraries and executed as root.

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Impact

By altering LD_PRELOAD, attackers could cause malicious libraries to be loaded by programs called from setuid root programs, which then could execute arbitrary code as root.

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Solution

Apply vendor patches; see the Systems Affected section below.

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Vendor Information

686403

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Caldera __ Affected

Notified: August 30, 2000 Updated: May 15, 2001

Status

Affected

Vendor Statement

<http://www.linuxsecurity.com/advisories/caldera_advisory-657.html&gt;

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

FreeBSD __ Affected

Notified: September 08, 2000 Updated: May 15, 2001

Status

Affected

Vendor Statement

Since FreeBSD does not use glibc (which is Linux-specific software) we are not vulnerable to the unsetenv() bug.

However, FreeBSD does have some minor issues in its locale implementation. These do not affect any program in the FreeBSD base system (i.e. they are not exploitable locally or remotely on a FreeBSD system with no third party software installed), and no such third party software (including ports) are in fact known to be vulnerable. We recommend users obtain FreeBSD Security Advisory 00:47 for more information including instructions for detecting vulnerable binaries.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

MandrakeSoft __ Affected

Notified: August 30, 2000 Updated: May 15, 2001

Status

Affected

Vendor Statement

<http://www.linuxsecurity.com/advisories/mandrake_advisory-667.html&gt;

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

TurboLinux __ Affected

Notified: February 19, 2001 Updated: May 15, 2001

Status

Affected

Vendor Statement

<http://www.linuxsecurity.com/advisories/turbolinux_advisory-1158.html&gt;

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

Apple __ Not Affected

Notified: September 08, 2000 Updated: May 15, 2001

Status

Not Affected

Vendor Statement

We've determined that glibc is not used in Mac OS X, and we are therefore not exposed to the problems identified within glibc.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

Compaq Computer Corporation __ Not Affected

Notified: September 08, 2000 Updated: May 15, 2001

Status

Not Affected

Vendor Statement

(c) Copyright 2000 Compaq Computer Corporation. All rights reserved.

SOURCE: Compaq Computer Corporation Compaq Services Software Security Response Team USA

The reported problems have not been found to affect the as shipped, Compaq Tru64/UNIX Operating Systems Software.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

Fujitsu __ Not Affected

Notified: September 08, 2000 Updated: May 15, 2001

Status

Not Affected

Vendor Statement

Regarding VU#686403 (ld.so fails to unset LD_PRELOAD before executing suid root programs), the Fujitsu UXP/V operating system is not vulnerable to this problem.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

Hewlett Packard __ Not Affected

Notified: September 08, 2000 Updated: May 15, 2001

Status

Not Affected

Vendor Statement

HP-UX does not implement LD_PRELOAD.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

Microsoft __ Not Affected

Notified: September 08, 2000 Updated: May 15, 2001

Status

Not Affected

Vendor Statement

Received confirmation from our development team and we are NOT vulnerable to the various scenarios described.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

OpenBSD __ Not Affected

Notified: September 08, 2000 Updated: May 15, 2001

Status

Not Affected

Vendor Statement

Vendor has reported no products having this vulnerability

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

SCO __ Not Affected

Notified: September 08, 2000 Updated: May 15, 2001

Status

Not Affected

Vendor Statement

SCO OpenServer Release 5 and UnixWare 7 systems are not vulnerable to this exploit. The static and dynamic loaders in SCO products do not use LD_PRELOAD.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

BSDI Unknown

Notified: September 08, 2000 Updated: May 15, 2001

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

Data General Unknown

Notified: September 08, 2000 Updated: May 15, 2001

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

IBM Unknown

Notified: September 08, 2000 Updated: May 15, 2001

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

NCR Unknown

Notified: September 08, 2000 Updated: May 15, 2001

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

NEC Unknown

Notified: September 08, 2000 Updated: May 15, 2001

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

NeXT Unknown

Notified: September 08, 2000 Updated: May 15, 2001

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

NetBSD Unknown

Notified: September 08, 2000 Updated: May 15, 2001

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

RedHat Unknown

Notified: September 08, 2000 Updated: May 15, 2001

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

SGI Unknown

Notified: September 08, 2000 Updated: May 15, 2001

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

Siemens Nixdorf Unknown

Notified: September 08, 2000 Updated: May 15, 2001

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

Sony Unknown

Notified: September 08, 2000 Updated: May 15, 2001

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

Sun Unknown

Notified: September 08, 2000 Updated: May 15, 2001

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

Unisys Unknown

Notified: September 08, 2000 Updated: May 15, 2001

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23686403 Feedback>).

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References

<http://www.securityfocus.com/vdb/bottom.html?vid=1639&gt;

Acknowledgements

The original public announcement was by Solar Designer .

This document was last modified by Tim Shimeall

Other Information

CVE IDs:	CVE-2000-0824
Severity Metric:	6.73 Date Public: