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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

AuthorNote
sbeattie
introduced in b9eb92ab05204df772eb4929eccd018637c9f3e9,
so glibc 2.23

Priority

Low

Cvss 3 Severity Score

3.3

Score breakdown

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