Arch Linux Security Advisory ASA-202002-12
=========================================
Severity: Critical
Date    : 2020-02-25
CVE-ID  : CVE-2020-8955 CVE-2020-9759 CVE-2020-9760
Package : weechat
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1103

Summary
======
The package weechat before version 2.7.1-1 is vulnerable to multiple
issues including arbitrary code execution and denial of service.

Resolution
=========
Upgrade to 2.7.1-1.

# pacman -Syu "weechat>=2.7.1-1"

The problems have been fixed upstream in version 2.7.1.

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

Description
==========
- CVE-2020-8955 (arbitrary code execution)

A heap-based out-of-bounds write has been found in the IRC plugin of
Weechat before 2.7.1, in irc-mode.c, when receiving a malformed IRC
message 324 (channel mode).

- CVE-2020-9759 (denial of service)

A heap-based out-of-bounds read has been found in Weechat before 2.7.1,
when receiving a malformed IRC message 352 (WHO). It could lead to a
off-by-one read resulting in denial of service (crash).

- CVE-2020-9760 (arbitrary code execution)

A heap-based out-of-bounds write has been found in Weechat before
2.7.1, when a new IRC message 005 is received with longer nick
prefixes. It could lead to writing out of the allocated prefixes array
when setting a prefix, resulting in denial of service (crash) or even
arbitrary code execution.

Impact
=====
A remote attacker can crash the client and execute code remotely via a
malformed message.

References
=========
https://weechat.org/news/113/20200220-Version-2.7.1-security-release/
https://github.com/weechat/weechat/commit/51a739df615f8ec66fbe1e9682ec3c3218254ad7
https://github.com/weechat/weechat/commit/c827d6fa864e2c0b79cea640c45272e83703081e
https://github.com/weechat/weechat/commit/694b5c9f874d7337cd2e03761e0de435275dd64d
https://security.archlinux.org/CVE-2020-8955
https://security.archlinux.org/CVE-2020-9759
https://security.archlinux.org/CVE-2020-9760