Critical Vulnerability Patched in Android File System Daemon

CVSScvssV3_1: 8.4

The Android volume daemon (vold) is responsible for mounting and unmounting external storage volumes like SD cards. A vulnerability was recently discovered in vold’s read_block function that could allow a local attacker to execute arbitrary code.

The vulnerability, tracked as CVE-2023-42535, is a out-of-bounds write issue. This occurs when vold improperly handles specially crafted requests to read blocks from a volume. By triggering a write past the end of the allocated buffer, an attacker could overwrite adjacent memory and inject malicious code.

With local access to an affected Android device, a hacker could develop an app or script to exploit this flaw. If successful, they would gain full control over the device. Private files, passwords, and sensitive data would all be at risk of theft or modification.

Google has released an update to vold through the November 2023 Android security patch level. It is recommended that all Android users keep their devices and apps updated with the latest security fixes. Also be cautious about installing apps from unknown third-party sources, as they could potentially carry exploits targeting vulnerabilities like this one. Staying vigilant about mobile security helps prevent attackers from gaining a foothold on our devices.