markparticle WebServer Buffer Overflow Vulnerability in Buffer::HasWritten Function

A critical buffer overflow vulnerability has been identified in markparticle WebServer versions through 1.0. The issue arises in the Buffer::HasWritten function within buffer.cpp, where improper handling of the writePos_ argument allows for arbitrary memory writing. This vulnerability can be exploited remotely, without authentication, and has been publicly disclosed along with a proof-of-concept exploit.

Impact

Exploitation of this vulnerability leads to a buffer overflow, which can commonly result in arbitrary code execution or causing a denial-of-service condition.