Windows User Account Control Bypassed Using Character Editor to Escalate Privileges

Source: Cyber Security News

Author: Guru Baran

URL: https://cybersecuritynews.com/windows-user-account-control-bypassed/

ONE SENTENCE SUMMARY:

A new technique using Windows Private Character Editor exploits UAC, enabling privilege escalation without user intervention, alarming administrators.

MAIN POINTS:

1. Matan Bahar discovered the technique exploiting Windows Private Character Editor to bypass UAC.
2. The utility, eudcedit.exe, is used to create and edit End-User Defined Characters.
3. Vulnerability leverages critical configurations in eudcedit.exe’s application manifest.
4. Key metadata tags enable automatic elevation to administrative privileges.
5. UAC can be bypassed with permissive settings like “Elevate without prompting.”
6. Attackers use font linking in the editor to manipulate file handling for command execution.
7. The process allows execution of arbitrary commands via high-privilege PowerShell sessions.
8. Microsoft typically doesn’t patch UAC bypasses as UAC isn’t considered a security boundary.
9. The simplicity of this method raises security concerns for enterprise teams.
10. ANY.RUN offers a trial for threat data to enhance incident response.

TAKEAWAYS:

1. Legitimate system utilities can be weaponized effectively for attacks.
2. Microsoft’s stance on UAC has remained unchanged; security boundary not considered.
3. Administrators should review UAC configuration settings for enhanced security.
4. Awareness and monitoring of potential exploitation paths are crucial.
5. Enterprises must stay informed on emerging threats and vulnerabilities.