CVE-2014-9933

Vulnerability

Missing input validation in the HLOS (High-Level Operating System) fuse write path allows writing to fuses that should be restricted. This affects all Android releases from Code Aurora Forum (CAF) that use the Linux kernel. The issue is described in the Android Security Bulletin for April 2017 [1].

Exploitation

An attacker with local execution privileges on an affected device can exploit this vulnerability. No additional authentication or user interaction is required beyond gaining local code execution. The attacker can write arbitrary values to fuses that are normally protected from HLOS access.

Impact

Successful exploitation allows the attacker to write to restricted fuses, potentially altering hardware configuration or security settings. This could lead to permanent device compromise, as fuses control critical security features such as bootloader locking and key storage.

Mitigation

The vulnerability is addressed by an update in the Android Security Bulletin dated April 2017 [1]. Users should apply the latest security patch level from their device manufacturer. No workaround exists without the fix.