Description
CommuniCrypt Mail versions up to and including 1.16 contains a stack-based buffer overflow vulnerability in its ANSMTP.dll and AOSMTP.dll ActiveX controls, specifically within the AddAttachments() method. This method fails to properly validate the length of input strings, allowing data to exceed the bounds of a fixed-size stack buffer. When invoked with an overly long string, the control can corrupt adjacent memory structures, including exception handlers, leading to potential control flow disruption.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| CommuniCrypt Software | CommuniCrypt Mail | ≤ 1.16 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Metasploit 1 module
-
CommuniCrypt Mail 1.16 SMTP ActiveX Stack Buffer Overflow
exploit/windows/browser/communicrypt_mail_activex
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/browser/communicrypt_mail_activex.rb exploit
- https://www.exploit-db.com/exploits/12663 exploit
- https://www.broadcom.com/support/security-center/attacksignatures/detail?asid=24374 third-party-advisory
- https://softwarelode.com/4185/details-communicrypt-mail.html product
- https://www.fortiguard.com/encyclopedia/ips/23099 third-party-advisory
- https://www.vulncheck.com/advisories/communicrypt-mail-activex-control-buffer-overflow third-party-advisory