CVE-2019-8455

A hard-link created from the log file of Check Point ZoneAlarm up to 15.4.062 to any file on the system will get its permission changed so that all users can access that linked file. Doing this on files with limited access gains the local attacker higher privileges to the file.

Weakness

The product, when opening a file or directory, does not sufficiently handle when the name is associated with a hard link to a target that is outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.

Affected Software

Potential Mitigations

• Follow the principle of least privilege when assigning access rights to entities in a software system.
• Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

References

• http://www.securityfocus.com/bid/108029
• https://www.zonealarm.com/software/release-history/zafavfw.html#15.4.260.17960
• http://www.securityfocus.com/bid/108029
• https://www.zonealarm.com/software/release-history/zafavfw.html#15.4.260.17960