[arch-security] [ASA-201604-6] mercurial: arbitrary code execution

[Levente Polyak]

Arch Linux Security Advisory ASA-201604-6
=========================================

Severity: Critical
Date    : 2016-04-06
CVE-ID  : CVE-2016-3068 CVE-2016-3069 CVE-2016-3630
Package : mercurial
Type    : arbitrary code execution
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package mercurial before version 3.7.3-1 is vulnerable to arbitrary
code execution.

Resolution
==========

Upgrade to 3.7.3-1.

# pacman -Syu "mercurial>=3.7.3-1"

The problems have been fixed upstream in version 3.7.3.

Workaround
==========

None.

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

- CVE-2016-3068 (arbitrary code execution)

It was reported that in mercurial, there is similar vulnerability as
CVE-2015-7545 in git. Git's git-remote-ext remote helper provides an
ext:: URL scheme that allows running arbitrary shell commands. Mercurial
allows specifying git repositories as subrepositories. Git ext:: URLs
can be specified as Mercurial subrepositories allowing arbitrary shell
commands to be run on `hg clone`.

- CVE-2016-3069 (arbitrary code execution)

It was reported that Convert extension in mercurial is vulnerable to
command execution. Incorrect handling of command line parameters allows
passing a full Git remote URL via a directory name. The Git ext:: URL
scheme can be used to obtain arbitrary command execution. Furthermore,
lack of escaping of shell metacharacters allows arbitrary command
injection, which is another way of exploiting the vulnerable code.

- CVE-2016-3630 (arbitrary code execution)

Two bounds-checking errors have been discovered in the binary delta
decoder that may be exploitable via clone, push, or pull leading to
arbitrary code execution.

Impact
======

A remote attacker is able to execute arbitrary code via the mercurial
convert extension, git subrepositories or a vulnerability in the binary
delta decoder.

References
==========

https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_3.7.3_.282016-3-29.29
https://access.redhat.com/security/cve/CVE-2016-3068
https://access.redhat.com/security/cve/CVE-2016-3069
https://access.redhat.com/security/cve/CVE-2016-3630
https://bugs.archlinux.org/task/48821

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