Remote code execution in mIRC

1) Command injection

EUVDB-ID: #VU17806

Risk: High

CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-6453

CWE-ID: CWE-77 - Command injection

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary commands on the target system.

The weakness exists due to argument injection through custom URI protocol handlers. A remote attacker can trick the victim into visiting a specially crafted web-page and specify an irc:// URI that loads an arbitrary .ini file from a UNC share pathname to inject arbitrary commands and execute arbitrary code with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

Update to version 7.55.

Vulnerable software versions

mIRC: 6.1 - 7.54

External links

http://proofofcalc.com/cve-2019-6453-mIRC/

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. However, proof of concept for this vulnerability is available.