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Glibc Dynamic Loader Hit By A Nasty Local Privilege Escalation Vulnerability
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this post was submitted on 04 Oct 2023
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This is the best summary I could come up with:
A nasty vulnerability has been made public today concerning Glibc's dynamic loader that can lead to full root privileges being obtained by local users.
This affects Linux distributions of the past two years with the likes of Ubuntu 22.04 LTS, 23.04, Fedora 38, and others vulnerable to this local privilege escalation issue.
Qualys announced this vulnerability a few minutes ago: "The GNU C Library's dynamic loader "find[s] and load[s] the shared objects (shared libraries) needed by a program, prepare[s] the program to run, and then run[s] it" (man ld.so).
Recently, we discovered a vulnerability (a buffer overflow) in the dynamic loader's processing of the GLIBC_TUNABLES environment variable.
This vulnerability was introduced in April 2021 (glibc 2.34) by commit 2ed18c ("Fix SXID_ERASE behavior in setuid programs (BZ #27471)").
In the interim we are already seeing actions take place such as Debian temporarily restricting access to some of their systems until they are patched against this local privilege escalation vulnerability.
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