[ASA-201801-13] transmission-cli: arbitrary command execution

[Levente Polyak]

Arch Linux Security Advisory ASA-201801-13
==========================================

Severity: High
Date    : 2018-01-17
CVE-ID  : CVE-2018-5702
Package : transmission-cli
Type    : arbitrary command execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-588

Summary
=======

The package transmission-cli before version 2.92-8 is vulnerable to
arbitrary command execution.

Resolution
==========

Upgrade to 2.92-8.

# pacman -Syu "transmission-cli>=2.92-8"

The problem has been fixed upstream but no release is available yet.

Workaround
==========

Enable authentication in the transmission-daemon using a strong
password.

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

The transmission-daemon in Transmission before 2.93 relies on
X-Transmission-Session-Id (which is not a forbidden header for Fetch)
for access control, which allows remote attackers to execute arbitrary
RPC commands, and consequently write to arbitrary files, via POST
requests to /transmission/rpc in conjunction with a DNS rebinding
attack.

Impact
======

A remote attacker is able to execute arbitrary RPC commands and
consequently write to arbitrary files by tricking a user into visiting
a malicious website.

References
==========

https://bugs.archlinux.org/task/57086
http://www.openwall.com/lists/oss-security/2018/01/12/1
https://bugs.chromium.org/p/project-zero/issues/detail?id=1447
https://github.com/transmission/transmission/commit/eb5d1a79cbe1b9bc5b22fdcc598694ecd4d02f43
https://github.com/transmission/transmission/pull/468
https://security.archlinux.org/CVE-2018-5702

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