Use-after-free in Irssi

1) Use-after-free

EUVDB-ID: #VU32046

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-2017-15227

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

Irssi before 1.0.5, while waiting for the channel synchronisation, may incorrectly fail to remove destroyed channels from the query list, resulting in use-after-free conditions when updating the state later on.

Mitigation

Install update from vendor's website.

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.