Multiple vulnerabilities in WeeChat
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2020-8955 CVE-2020-9760 CVE-2020-9759 |
| CWE-ID | CWE-119 CWE-476 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
WeeChat Client/Desktop applications / Messaging software |
| Vendor | WeeChat.org |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
Updated 25.03.2020
Added vulnerabilities #2-3
1) Buffer overflow
EUVDB-ID: #VU25599
Risk: High
CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-8955
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsWeeChat: 2.0 - 2.7
External linkshttp://github.com/weechat/weechat/commit/6f4f147d8e86adf9ad34a8ffd7e7f1f23a7e74da
http://weechat.org/doc/security/
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.
2) Buffer overflow
EUVDB-ID: #VU26384
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-2020-9760
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error when a new IRC message 005 is received with longer nick prefixes. A remote attacker can send a specially crafted message 005, trigger memory corruption and cause a denial of service condition on the target system when a new mode is set for a nick.
MitigationInstall updates from vendor's website.
Vulnerable software versionsWeeChat: 0.3.4 - 2.7
External linkshttp://github.com/weechat/weechat/commit/40ccacb4330a64802b1f1e28ed9a6b6d3ca9197f
http://lists.debian.org/debian-lts-announce/2020/03/msg00031.html
http://weechat.org/doc/security/
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.
3) NULL pointer dereference
EUVDB-ID: #VU26383
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 - NULL Pointer Dereference
Exploit availability: No
DescriptionThe 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.
MitigationCybersecurity Help is currently unaware of any official solution to address this vulnerability..
Vulnerable software versionsWeeChat: 0.4.0 - 2.7
External linkshttp://github.com/weechat/weechat/commit/9904cb6d2eb40f679d8ff6557c22d53a3e3dc75a
http://lists.debian.org/debian-lts-announce/2020/03/msg00031.html
http://weechat.org/doc/security/
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.
