CVE-2019-19126

NameCVE-2019-19126
DescriptionOn 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3152-1
Debian Bugs945250

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
glibc (PTS)buster2.28-10+deb10u1vulnerable
buster (security)2.28-10+deb10u2fixed
bullseye2.31-13+deb11u4fixed
bookworm, sid2.36-5fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
glibcsourcejessie(not affected)
glibcsourcebuster2.28-10+deb10u2DLA-3152-1
glibcsource(unstable)2.29-8945250

Notes

[jessie] - glibc <not-affected> (Vulnerable code introduced in 2.23)
https://sourceware.org/bugzilla/show_bug.cgi?id=25204
Introduced by: https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=object;h=b9eb92ab05204df772eb4929eccd018637c9f3e9
Fixed by: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d5dfad4326fc683c813df1e37bbf5cf920591c8e

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