CVE-2018-10722

In Cylance CylancePROTECT before 1470, an unprivileged local user can obtain SYSTEM privileges because users have Modify access to the %PROGRAMFILES%CylanceDesktoplog folder, the CyUpdate process grants users Modify access to new files created in this folder, and a new file can be a symlink chain to a pathname of an arbitrary DLL that CyUpdate uses.

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

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.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/132.html
• https://cwe.mitre.org/data/definitions/17.html
• https://cwe.mitre.org/data/definitions/35.html
• https://cwe.mitre.org/data/definitions/76.html

References

• https://www.atredis.com/blog/cylance-privilege-escalation-vulnerability
• https://www.atredis.com/blog/cylance-privilege-escalation-vulnerability