CVE-2023-4911
Published: 3 October 2023
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.
Notes
| Author | Note |
|---|---|
Priority reason: Local privilege escalation in a package that is installed on all Ubuntu instances. |
|
| alexmurray | Upstream advisory states this was introduced in April 2021 (glibc 2.34) by commit 2ed18c5b534d9e92fc006202a5af0df6b72e7aca |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
glibc Launchpad, Ubuntu, Debian |
trusty |
Ignored
(end of standard support)
|
| xenial |
Not vulnerable
(code not present)
|
|
| bionic |
Not vulnerable
(code not present)
|
|
| focal |
Not vulnerable
(code not present)
|
|
| upstream |
Needs triage
|
|
| jammy |
Released
(2.35-0ubuntu3.4)
|
|
| lunar |
Released
(2.37-0ubuntu2.1)
|
|
| mantic |
Released
(2.38-1ubuntu6)
|
|
|
eglibc Launchpad, Ubuntu, Debian |
trusty |
Not vulnerable
(code not present)
|
| xenial |
Does not exist
|
|
| bionic |
Does not exist
|
|
| focal |
Does not exist
|
|
| jammy |
Does not exist
|
|
| lunar |
Does not exist
|
|
| upstream |
Needs triage
|
|
| mantic |
Does not exist
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |