Subject: [ASA-201901-3] elfutils: denial of service

Arch Linux Security Advisory ASA-201901-3
=========================================

Severity: Medium
Date    : 2019-01-08
CVE-ID  : CVE-2018-18310 CVE-2018-18520 CVE-2018-18521
Package : elfutils
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-785

Summary
=======

The package elfutils before version 0.175-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 0.175-1.

# pacman -Syu "elfutils>=0.175-1"

The problems have been fixed upstream in version 0.175.

Workaround
==========

None.

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

- CVE-2018-18310 (denial of service)

An invalid memory address dereference was discovered in
dwfl_segment_report_module.c in libdwfl in elfutils through v0.174. The
vulnerability allows attackers to cause a denial of service
(application crash) with a crafted ELF file.

- CVE-2018-18520 (denial of service)

An Invalid Memory Address Dereference exists in the function elf_end in
libelf in elfutils through v0.174. Although eu-size is intended to
support ar files inside ar files, handle_ar in size.c closes the outer
ar file before handling all inner entries. The vulnerability allows
attackers to cause a denial of service (application crash) with a
crafted ELF file.

- CVE-2018-18521 (denial of service)

Divide-by-zero vulnerabilities in the function arlib_add_symbols() in
arlib.c in elfutils 0.174 allow remote attackers to cause a denial of
service (application crash) with a crafted ELF file, as demonstrated by
eu-ranlib, because a zero sh_entsize is mishandled.

Impact
======

An attacker can crash an application using one of the elfutils
libraries to parse files via a crafted ELF file.

References
==========

https://sourceware.org/bugzilla/show_bug.cgi?id=23752
https://sourceware.org/ml/elfutils-devel/2018-q4/msg00022.html
https://sourceware.org/bugzilla/show_bug.cgi?id=23787
https://sourceware.org/ml/elfutils-devel/2018-q4/msg00057.html
https://sourceware.org/bugzilla/show_bug.cgi?id=23786
https://sourceware.org/ml/elfutils-devel/2018-q4/msg00055.html
https://security.archlinux.org/CVE-2018-18310
https://security.archlinux.org/CVE-2018-18520
https://security.archlinux.org/CVE-2018-18521