In CISOfy Lynis 2.x through 2.7.5, the license key can be obtained by looking at the process list when a data upload is being performed. This license can be used to upload data to a central Lynis server. Although no data can be extracted by knowing the license key, it may be possible to upload the data of additional scans.

CISOfy Lynis before 3.0.0 has Incorrect Access Control because of a TOCTOU race condition. The routine to check the log and report file permissions was not working as intended and could be bypassed locally. Because of the race, an unprivileged attacker can set up a log and report file, and control that up to the point where the specific routine is doing its check. After that, the file can be removed, recreated, and used for additional attacks.

Unspecified tests in Lynis before 2.5.0 allow local users to write to arbitrary files or possibly gain privileges via a symlink attack on a temporary file.

include/tests_webservers in Lynis before 1.5.5 on AIX allows local users to overwrite arbitrary files via a symlink attack on a /tmp/lynis.##### file.

include/tests_webservers in Lynis before 1.5.5 allows local users to overwrite arbitrary files via a symlink attack on a /tmp/lynis.*.unsorted file with an easily determined name.