Title: 1st Class Internet Solutions 1st Class Mail Server Remote Buffer Overflow Vulnerability
Severity: HIGH
Description:
1st Class Mail Server is an email/web mail server solution developed and maintained by 1st Class Internet Solutions.
1st Class Mail Server has been reported prone to a remote buffer overflow vulnerability. The issue exists due to a lack of sufficient boundary checks performed on user-supplied data (It has been conjectured that the vulnerable code exists in network2.cpp, this however has not been confirmed).
A remote attacker may pass excessive data (>626 Bytes) as the second argument for an APOP command passed to the affected server. Data that exceeds the size of a reserved buffer in stack-based memory will overrun its bounds resulting in the corruption of adjacent memory. An attacker may exploit this issue to corrupt a saved instruction pointer and in doing so may potentially influence execution flow of the affected service into attacker-supplied instructions. Code execution will occur in the context of the affected server process.
This vulnerability has been reported to affect 1st Class Mail Server version 4, other version might also be affected.
Affected Products:
- 1st Class Internet Solutions 1st Class Mail Server 4.0.0
References:
- 1st Class Internet Solutions: 1st Class Mail Server Homepage
- JeFFOsZ <JeFFOsZ@1337.be>: POP3 Server Buffer Overflow
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