CVE-2019-19126
Published: 19 November 2019
On the x86-64 architecture, the GNU C Library (aka glibc) before 2.31 fails to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition, allowing local attackers to restrict the possible mapping addresses for loaded libraries and thus bypass ASLR for a setuid program.
Notes
Author | Note |
---|---|
sbeattie |
introduced in b9eb92ab05204df772eb4929eccd018637c9f3e9, so glibc 2.23 |
Priority
Status
Package | Release | Status |
---|---|---|
eglibc
Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Not vulnerable
|
|
upstream |
Needs triage
|
|
xenial |
Does not exist
|
|
glibc
Launchpad, Ubuntu, Debian |
bionic |
Released
(2.27-3ubuntu1.2)
|
disco |
Ignored
(end of life)
|
|
eoan |
Released
(2.30-0ubuntu2.2)
|
|
focal |
Not vulnerable
(2.31-0ubuntu7)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(2.31)
|
|
xenial |
Released
(2.23-0ubuntu11.2)
|
|
Patches:
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d5dfad4326fc683c813df1e37bbf5cf920591c8e |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 3.3 |
Attack vector | Local |
Attack complexity | Low |
Privileges required | Low |
User interaction | None |
Scope | Unchanged |
Confidentiality | Low |
Integrity impact | None |
Availability impact | None |
Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |