Description
When using the LD_PRELOAD environmental variable in SUID or SGID applications, glibc does not verify that preloaded libraries in /etc/ld.so.cache are also SUID/SGID, which could allow a local user to overwrite arbitrary files by loading a library from /lib or /usr/lib.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- GLIBC 2.1.3 - 'LD_PRELOAD' Local Privilege Escalation EDB-290 · local · Mar 4, 2001 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- SuSE-SA:2001:01 vendor-advisory
- DSA-039 vendor-advisory
- linux-glibc-preload-overwrite(5971) vdb-entry
- 2223 vdb-entry
- 20010121 Trustix Security Advisory - glibc mailing-list
- MDKSA-2001:012 vendor-advisory
- RHSA-2001:002 vendor-advisory
- TLSA2000021-2 vendor-advisory
- CSSA-2001-007 vendor-advisory