[ASA-201911-3] glibc: information disclosure

[Christian Rebischke]

Arch Linux Security Advisory ASA-201911-3
=========================================

Severity: High
Date    : 2019-11-03
CVE-ID  : CVE-2019-9169
Package : glibc
Type    : information disclosure
Remote  : No
Link    : https://security.archlinux.org/AVG-855

Summary
=======

The package glibc before version 2.30-1 is vulnerable to information
disclosure.

Resolution
==========

Upgrade to 2.30-1.

# pacman -Syu "glibc>=2.30-1"

The problem has been fixed upstream in version 2.30.

Workaround
==========

None.

Description
===========

In the GNU C Library (aka glibc or libc6) through 2.29,
proceed_next_node in posix/regexec.c has a heap-based buffer over-read
via an attempted case-insensitive regular-expression match.

Impact
======

An attacker is able to use malicious regular expressions to get access
to sensitive information.

References
==========

https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=583dd860d5b833037175247230a328f0050dbfe9
https://sourceware.org/bugzilla/show_bug.cgi?id=24114
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34142
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34140
https://security.archlinux.org/CVE-2019-9169
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