This Metasploit module attempts to gain root privileges on Linux systems by abusing a vulnerability in the GNU C Library (glibc) dynamic linker with libmemusage.so library.
866ac744c655ede9c376e4a47945a3a0e64a8cdb089b30ec2822adfef9bb9512This Metasploit module attempts to gain root privileges on Linux systems by abusing a vulnerability in the GNU C Library (glibc) dynamic linker. glibc ld.so in versions before 2.11.3, and 2.12.x before 2.12.2 does not properly restrict use of the LD_AUDIT environment variable when loading setuid executables which allows control over the $ORIGIN library search path resulting in execution of arbitrary shared objects. This Metasploit module opens a file descriptor to the specified suid executable via a hard link, then replaces the hard link with a shared object before instructing the linker to execute the file descriptor, resulting in arbitrary code execution. The specified setuid binary must be readable and located on the same file system partition as the specified writable directory. This Metasploit module has been tested successfully on glibc version 2.5 on CentOS 5.4 (x86_64), 2.5 on CentOS 5.5 (x86_64) and 2.12 on Fedora 13 (i386). RHEL 5 is reportedly affected, but untested. Some versions of ld.so hit a failed assertion in dl_open_worker causing exploitation to fail.
9a6bdfa99ad597fe9f9517dd0f8bdc9cdeba67fff5dacc64d849ac9bf5bfbfedThis Metasploit module attempts to gain root privileges on Linux systems by abusing a vulnerability in the GNU C Library (glibc) dynamic linker. glibc ld.so in versions before 2.11.3, and 2.12.x before 2.12.2 does not properly restrict use of the LD_AUDIT environment variable when loading setuid executables. This allows loading arbitrary shared objects from the trusted library search path with the privileges of the suid user. This Metasploit module uses LD_AUDIT to load the libpcprofile.so shared object, distributed with some versions of glibc, and leverages arbitrary file creation functionality in the library constructor to write a root-owned world-writable file to a system trusted search path (usually /lib). The file is then overwritten with a shared object then loaded with LD_AUDIT resulting in arbitrary code execution. This Metasploit module has been tested successfully on glibc version 2.11.1 on Ubuntu 10.04 x86_64 and version 2.7 on Debian 5.0.4 i386. RHEL 5 is reportedly affected, but untested. Some glibc distributions do not contain the libpcprofile.so library required for successful exploitation.
79d3dcb40544179ef2c545514e54b7352e225d51c57c720672f33d1b717c00e5Gentoo Linux Security Advisory 201312-1 - Multiple vulnerabilities have been found in GNU C Library, the worst of which allowing arbitrary code execution and privilege escalation. Versions less than 2.15-r3 are affected.
93933af2bf688207043ef3e436cfab262e2d341cca4b4649e9a182df161805b5Debian Linux Security Advisory 2122-2 - Colin Watson discovered that the update for stable released in DSA-2122-1 did not complete address the underlying security issue in all possible scenarios.
3860213fd8ec52be5e04327afe52e5b2dc33b4120e52003debbd523b092c0bceVMware Security Advisory 2011-0001 - ESX 4.0 Service Console OS (COS) updates for glibc, sudo, and openldap packages.
c46f8a177cb54cdf53c56e8c0fc1617a7a611c96438fab66c017b274544829edGentoo Linux Security Advisory 201011-1 - Multiple vulnerabilities were found in glibc, the worst of which allowing local attackers to execute arbitrary code as root. Multiple vulnerabilities were found in glibc, amongst others the widely-known recent LD_AUDIT and $ORIGIN issues. For further information please consult the CVE entries referenced below. Versions less than 2.11.2-r3 are affected.
e7fd1080a732debd69f8864702d36b5571373a61bee34c47c11be74bc1e37420Ubuntu Security Notice 1009-1 - Tavis Ormandy discovered multiple flaws in the GNU C Library's handling of the LD_AUDIT environment variable when running a privileged binary. A local attacker could exploit this to gain root privileges.
436a2e4feaa4238d9dba3a9f3b177ddc072f40c78aff95073498c45ecf37ac5cDebian Linux Security Advisory 2122-1 - Ben Hawkes and Tavis Ormandy discovered that the dynamic loader in GNU libc allows local users to gain root privileges using a crafted LD_AUDIT environment variable.
857fca073644547dae968ea11ffbcdca81c4d210891ea09f1af7219cd193c2c6Mandriva Linux Security Advisory 2010-207 - A vulnerability in the GNU C library was discovered which could escalate the privileges for local users.
f405d8ffe59773887cfc06a8a0cd395ef6f4c45e1f6042074edec9ef29999e68The GNU C library dynamic linker suffers from an $ORIGIN expansion vulnerability.
c7b3de2fd4f6e322d777f6c679824b18538afa2600db0b0d4feac2239de8466a
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