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Category:   Application (Generic)  >   Glibc Vendors:   GNU [multiple authors]
Glibc LD_DEBUG Access Error May Disclose Information to Local Users
SecurityTracker Alert ID:  1010975
SecurityTracker URL:
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Aug 18 2004
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.3.4 and prior versions
Description:   A vulnerability was reported in glibc. A local user may be able to gain unauthorized access to information.

Brad Spengler reported that a bug in glibc allows LD_DEBUG on set user id (setuid) binaries in cases where it should not be allowed.

Gentoo reported that a local user can view the list of symbols a setuid application uses and the locations of those symbols. A local user may be able to modify a library that takes precedence over those symbols to obtain information.

Silvio Cesare is credited with discovering this flaw.

Impact:   A local user may be able to obtain information processed by a setuid application.
Solution:   The vendor has released a patch (glibc-sec-hotfix-20040804.patch). Individual Linux distribution vendors will be issuing fixed versions for their distributions.
Vendor URL: (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Aug 18 2004 (Gentoo Issues Fix) Glibc LD_DEBUG Access Error May Disclose Information to Local Users
Gentoo has released a fix.

 Source Message Contents

[Original Message Not Available for Viewing]

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