Title: Jordan Windows Telnet Server Username Stack Based Buffer Overrun Vulnerability
Severity: CRITICAL
Description:
Jordan Windows Telnet Server is a Telnet server for Microsoft Windows platforms.
Jordan Windows Telnet Server has been reported prone to a remote buffer overrun vulnerability. The issue has been reported to present itself when a username is supplied to the Telnet server that is 518 bytes in length. Due to a lack of bounds checking, when this username is copied into an insufficient reserved buffer in stack-based memory, data that exceeds the size of the buffer will overrun its bounds and corrupt adjacent memory.
An attacker may exploit this condition to corrupt a saved instruction pointer for the vulnerable function, and thereby influence execution flow into attacker supplied instructions. These instructions will subsequently be executed in the context of the affected service.
The severity of this vulnerability may be exaggerated due to the fact that the overflow occurs pre-authentication.
It should be noted that although this issue has been reported to affect Jordan Windows Telnet Server version 1.0, other versions might also be affected.
Affected Products:
- Jordan Windows Telnet Server 1.0.0
- Jordan Windows Telnet Server 1.2.0
References:
- Jordan: Windows Telnet Server Homepage
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