An issue was discovered in OSSEC 3.6.0. An uncontrolled recursion vulnerability in osxml.c occurs when a large number of opening and closing XML tags is used. Because recursion is used in ReadElem without restriction, an attacker can trigger a segmentation fault once unmapped memory is reached.

The agent in OSSEC through 3.1.0 on Windows allows local users to gain NT AUTHORITY\SYSTEM access via Directory Traversal by leveraging full access to the associated OSSEC server.

syscheck/seechanges.c in OSSEC 2.7 through 2.8.1 on NIX systems allows local users to execute arbitrary code as root.

Cross-site scripting (XSS) vulnerability in site/search.php in OSSEC Web UI before 0.9 allows remote attackers to inject arbitrary web script or HTML by leveraging an unanchored regex.

host-deny.sh in OSSEC before 2.8.1 writes to temporary files with predictable filenames without verifying ownership, which allows local users to modify access restrictions in hosts.deny and gain root privileges by creating the temporary files before automatic IP blocking is performed.