Buffer overflow in weechat (Alpine package)

1) Buffer overflow

EUVDB-ID: #VU25599

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-8955

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing IRC messages in irc_mode_channel_update() function in plugins/irc/irc-mode.c in WeeChat. A remote attacker can send a specially crafted IRC message 324 (channel mode), trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

weechat (Alpine package): 2.1-r0 - 2.7.1-r1

CPE2.3

• cpe:2.3:a:alpine:weechat_alpine_package:2.1-r0:*:*:*:*:alpine_linux:*:3.8
• cpe:2.3:a:alpine:weechat_alpine_package:2.2-r0:*:*:*:*:alpine_linux:*:3.8
• cpe:2.3:a:alpine:weechat_alpine_package:2.3-r0:*:*:*:*:alpine_linux:*:3.9

External links

https://git.alpinelinux.org/aports/commit/?id=3fb2fc4015bfd428e88e89710c3dd89db7d42b82
https://git.alpinelinux.org/aports/commit/?id=e0d9cb9d6eeb3d5b4e27c091209acedef80f1d9a
https://git.alpinelinux.org/aports/commit/?id=691f67170e02f0f5f18fb9ccc8ad18eb90708984

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.