GLSA 200408-16: glibc: Information leak with LD_DEBUG

Title:glibc: Information leak with LD_DEBUG
Bugs: #59526


glibc contains an information leak vulnerability allowing the debugging of SUID binaries.


The GNU C library defines various Unix-like "system calls" and other basic facilities needed for a standard POSIX-like application to operate.

Affected packages

Package Vulnerable Unaffected Architecture(s)
sys-libs/glibc <= 2.3.2-r10 >= 2.3.2-r11 alpha, arm, hppa, ia64, sparc, s390
sys-libs/glibc <= >= x86, ppc
sys-libs/glibc <= >= mips
sys-libs/glibc <= >= amd64
sys-libs/glibc <= >= ppc64


Silvio Cesare discovered a potential information leak in glibc. It allows LD_DEBUG on SUID binaries where it should not be allowed. This has various security implications, which may be used to gain confidentional information.


An attacker can gain the list of symbols a SUID application uses and their locations and can then use a trojaned library taking precendence over those symbols to gain information or perform further exploitation.


There is no known workaround at this time. All users are encouraged to upgrade to the latest available version of glibc.


All glibc users should upgrade to the latest version:

    # emerge sync
    # emerge -pv your_version
    # emerge your_version



This GLSA and any updates to it are available for viewing at the Gentoo Security Website:


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