| Name | CVE-2023-4911 |
| Description | A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with elevated privileges. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-5514-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| glibc (PTS) | buster | 2.28-10+deb10u1 | fixed |
| buster (security) | 2.28-10+deb10u2 | fixed |
| bullseye | 2.31-13+deb11u8 | fixed |
| bullseye (security) | 2.31-13+deb11u9 | fixed |
| bookworm | 2.36-9+deb12u4 | fixed |
| bookworm (security) | 2.36-9+deb12u6 | fixed |
| sid, trixie | 2.37-18 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| glibc | source | buster | (not affected) | | | |
| glibc | source | bullseye | 2.31-13+deb11u7 | | DSA-5514-1 | |
| glibc | source | bookworm | 2.36-9+deb12u3 | | DSA-5514-1 | |
| glibc | source | (unstable) | 2.37-12 | | | |
Notes
[buster] - glibc <not-affected> (Vulnerable code introduced later)
https://www.openwall.com/lists/oss-security/2023/10/03/2
Introduced by: https://sourceware.org/git/?p=glibc.git;a=commit;h=2ed18c5b534d9e92fc006202a5af0df6b72e7aca (glibc-2.34; backported in debian/2.31-12)
Fixed by: https://sourceware.org/git/?p=glibc.git;a=commit;h=1056e5b4c3f2d90ed2b4a55f96add28da2f4c8fa
https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt
https://sourceware.org/cgit/glibc/tree/advisories/GLIBC-SA-2023-0004