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Vulnerability of WeeChat: buffer overflow via irc_mode_channel_update

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via irc_mode_channel_update() of WeeChat, in order to trigger a denial of service, and possibly to run code.
Impacted systems: Debian, openSUSE Leap, SLES.
Severity of this alert: 3/4.
Creation date: 28/02/2020.
Références of this alert: CVE-2020-8955, DLA-2157-1, openSUSE-SU-2020:0248-1, VIGILANCE-VUL-31703.

Description of the vulnerability 

An attacker can trigger a buffer overflow via irc_mode_channel_update() of WeeChat, in order to trigger a denial of service, and possibly to run code.
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This vulnerability impacts software or systems such as Debian, openSUSE Leap, SLES.

Our Vigil@nce team determined that the severity of this security announce is important.

The trust level is of type confirmed by the editor, with an origin of internet client.

An attacker with a expert ability can exploit this computer vulnerability note.

Solutions for this threat 

Debian 8: new weechat packages.
New packages are available:
  Debian 8: weechat 1.0.1-1+deb8u3

openSUSE Leap 15.1: new weechat packages.
New packages are available:
  openSUSE Leap 15.1: weechat 2.1-lp151.3.3.1
  SUSE LE 15 RTM: weechat 2.1-bp150.3.3.1
  SUSE LE 15 SP1: weechat 2.1-bp151.4.3.1
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