NULL pointer dereference in Irssi

1) NULL pointer dereference

EUVDB-ID: #VU32043

Risk: Medium

CVSSv3.1: 6.5 [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-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

Update to version 1.0.5.

Vulnerable software versions

Irssi: 1.0.0 - 1.0.4

External links

http://openwall.com/lists/oss-security/2017/10/22/4
http://irssi.org/security/irssi_sa_2017_10.txt
http://lists.debian.org/debian-lts-announce/2017/12/msg00022.html
http://www.debian.org/security/2017/dsa-4016

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.