Arch Linux Advisory ASA-201708-14: Critical Subversion Command Exec Issue

Arch Linux Security Advisory ASA-201708-14
=========================================
Severity: Critical
Date    : 2017-08-15
CVE-ID  : CVE-2017-9800
Package : subversion
Type    : arbitrary command execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-379

Summary
======
The package subversion before version 1.9.7-1 is vulnerable to
arbitrary command execution.

Resolution
=========
Upgrade to 1.9.7-1.

# pacman -Syu "subversion>=1.9.7-1"

The problem has been fixed upstream in version 1.9.7.

Workaround
=========
None.

Description
==========
A security issue has been found in subversion < 1.9.7. A Subversion
client sometimes connects to URLs provided by the repository. This
happens in two primary cases: during 'checkout', 'export', 'update',
and 'switch', when the tree being downloaded contains svn:externals
properties; and when using 'svnsync sync' with one URL argument.
A maliciously constructed svn+ssh:// URL would cause Subversion clients
to run an arbitrary shell command. Such a URL could be generated by a
malicious server, by a malicious user committing to a honest server (to
attack another user of that server's repositories), or by a proxy
server.
The vulnerability affects all clients, including those that use
file://,  and plain (untunneled) svn://.

Impact
=====
A remote attacker can execute arbitrary command on the affected host by
tricking a user into executing a subversion command.

References
=========
https://subversion.apache.org/security/CVE-2017-9800-advisory.txt
https://lists.apache.org/thread/%This email address is being protected from spambots. You need JavaScript enabled to view it.%3E
https://security.archlinux.org/CVE-2017-9800