Sergey Bugaev

**Name of the Vulnerable Software and Affected Versions** GNU Hurd versions prior to 0.9 20210404-9 **Description** An issue was discovered that allows exploitation to gain full root access. This occurs when trying to exec a setuid executable, creating a window of time where the process has new privileges but still refers to the old task, making it accessible through the old process port. **Recommendations** For GNU Hurd versions prior to 0.9 20210404-9, update to version 0.9 20210404-9 or later to resolve the issue.

**Name of the Vulnerable Software and Affected Versions** GNU Hurd versions prior to 0.9 20210404-9 **Description** An issue in libports allows it to accept fake notification messages from any client on any port. This can lead to a port use-after-free situation, which can be exploited for local privilege escalation to gain full root access. **Recommendations** For versions prior to 0.9 20210404-9, update to version 0.9 20210404-9 or later to resolve the issue.

**Name of the Vulnerable Software and Affected Versions** GNU Hurd versions prior to 0.9 20210404-9 **Description** An issue was discovered that allows anyone to modify any files they can read, potentially leading to full root access. This is because a single pager port is shared among all users who mmap a file. **Recommendations** For GNU Hurd versions prior to 0.9 20210404-9, update to version 0.9 20210404-9 or later to resolve the issue.

**Name of the Vulnerable Software and Affected Versions** GNU Hurd versions prior to 0.9 20210404-9 **Description** An issue in the authentication protocol used by the proc server makes it vulnerable to man-in-the-middle attacks. This can be exploited for local privilege escalation, allowing attackers to gain full root access. **Recommendations** For versions prior to 0.9 20210404-9, update to version 0.9 20210404-9 or later to resolve the issue.