NULL pointer dereference in irssi (Alpine package)

1) NULL pointer dereference

EUVDB-ID: #VU32043

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-15721

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

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 Irssi before 1.0.5, certain incorrectly formatted DCC CTCP messages could cause a NULL pointer dereference. This is a separate, but similar, issue relative to CVE-2017-9468. A remote attacker can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

irssi (Alpine package): 1.0.3-r0 - 1.0.4-r0

irssi (Alpine package):

CPE2.3

• cpe:2.3:o:alpine:irssi_alpine_package:1.0.3-r0:*:*:*:*:alpine_linux:*:3.5
• cpe:2.3:o:alpine:irssi_alpine_package:1.0.4-r0:*:*:*:*:alpine_linux:*:3.5
• cpe:2.3:o:alpine:irssi_alpine_package::*:*:*:*:alpine_linux:*:*

External links

https://git.alpinelinux.org/aports/commit/?id=5ea4be178b85d817f049fdf01ba85be7923c6904
https://git.alpinelinux.org/aports/commit/?id=b8bf4317707fbf2f48603161b652e1f20dba65f0

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.