#VU18945 Use-after-free in Irssi - CVE-2019-13045

Vulnerability identifier: #VU18945

Vulnerability risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-13045

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Irssi
Client/Desktop applications / Messaging software

Vendor: Irssi.org

Description

The vulnerability allows a remote attacker to perform denial of service attack.

The vulnerability exists due to a use-after-free error when performing server reconnect with SASL authentication. A remote attacker can trigger the application to reconnect to the server (e.g. disrupt connection) that will cause application crash.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Irssi: 1.0.0 - 1.2.0

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External links
https://www.openwall.com/lists/oss-security/2019/06/29/1
https://github.com/irssi/irssi/commit/d23b0d22cc611e43c88d99192a59f413f951a955
https://irssi.org/security/irssi_sa_2019_06.txt

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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.