Vulnerability identifier: #VU81253
Vulnerability risk: Critical
CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-121
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Exim
Server applications /
Mail servers
Vendor: Exim
Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when handling NTLM challenge requests. A remote unauthenticated attacker can send specially crafted data to the server, trigger a stack-based buffer overflow and execute arbitrary code on the target system.
Mitigation
Install update from vendor's website.
Vulnerable software versions
Exim: 4.00 - 4.96
External links
http://www.zerodayinitiative.com/advisories/ZDI-23-1470/
http://www.exim.org/static/doc/security/CVE-2023-zdi.txt
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.