An issue was discovered in Open Source Social Network (OSSN) through 5.3. A user-controlled file path with a weak cryptographic rand() can be used to read any file with the permissions of the webserver. This can lead to further compromise. The attacker must conduct a brute-force attack against the SiteKey to insert into a crafted URL for components/OssnComments/ossn_com.php and/or libraries/ossn.lib.upgrade.php.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-10560
• https://github.com/LucidUnicorn/CVE-2020-10560-Key-Recovery
• https://techanarchy.net/blog/cve-2020-10560-ossn-arbitrary-file-read