Vulnerability identifier: #VU26383

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-9759

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
WeeChat
Client/Desktop applications / Messaging software

Vendor: WeeChat.org

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in the "callback" function. A remote attacker can send a specially crafted message 352 (who) and perform a denial of service (DoS) attack.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability..

Vulnerable software versions

WeeChat: 0.4.0 - 2.7

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External links
http://github.com/weechat/weechat/commit/9904cb6d2eb40f679d8ff6557c22d53a3e3dc75a
http://lists.debian.org/debian-lts-announce/2020/03/msg00031.html
http://weechat.org/doc/security/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.