Arch Linux Weechat Advisory ASA-201709-20 Medium Severity Denial Of Service

Arch Linux Security Advisory ASA-201709-20
=========================================
Severity: Medium
Date    : 2017-09-25
CVE-ID  : CVE-2017-14727
Package : weechat
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-412

Summary
======
The package weechat before version 1.9.1-1 is vulnerable to denial of
service.

Resolution
=========
Upgrade to 1.9.1-1.

# pacman -Syu "weechat>=1.9.1-1"

The problem has been fixed upstream in version 1.9.1.

Workaround
=========
Unload the logger plugin: /plugin unload logger

Description
==========
It has been discovered that in logger.c in the logger plugin before
weechat 1.9.1 the date/time conversion specifiers are expanded after
replacing buffer local variables in name of log files. In some cases,
this can lead to an error in function strftime and a crash caused by
the use of an uninitialized buffer.

Impact
=====
A remote attacker can crash the client via a specially crafted string.

References
=========
https://weechat.org/doc/weechat/security/
https://github.com/weechat/weechat/commit/e4cc90f4b43153dc1c6516c1f1aad2504faa5443
https://security.archlinux.org/CVE-2017-14727