CVE-2021-39672: Fastboot Secure Boot Bypass Vulnerability
Summary
CVE-2021-39672: In fastboot, there is a possible secure boot bypass due to a configuration error. Affects :unknown: versions >= SoCVersion:0, < SoCVersion:2022-02-05. Fixed in SoCVersion:2022-02-05. How to fix ↓
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Background
Fastboot is a protocol used to facilitate the flashing of Android devices. It allows users to modify the file system from a computer while the device is in bootloader mode. This functionality is crucial for developers and advanced users who need to install custom ROMs or recoveries. However, a configuration error in Fastboot has introduced a vulnerability that could potentially allow unauthorized access to system privileges.
Vulnerability Detail
The vulnerability identified as CVE-2021-39672 arises from a configuration error in Fastboot, leading to a possible secure boot bypass. This flaw allows local escalation of privilege without requiring additional execution privileges or user interaction. If exploited, an attacker could gain unauthorized access to sensitive system resources, posing a significant risk to the integrity and security of the device.
How To Fix
Minimum fixed version
SoCVersion:2022-02-05
This is the first release that contains the fix.
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Workaround
Currently, there are no specific workarounds to mitigate this vulnerability without applying the patch. Users are advised to update to the latest version as soon as possible.
Conclusion
The CVE-2021-39672 vulnerability in Fastboot poses a significant risk due to its potential for privilege escalation without user interaction. Users are strongly encouraged to update to the patched version to safeguard their devices against exploitation.
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FAQ
CVE-2021-39672 is a vulnerability in Fastboot that allows for a secure boot bypass due to a configuration error, potentially leading to unauthorized privilege escalation.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Exploitation of this vulnerability could allow attackers to gain unauthorized access to system resources, compromising the security and integrity of the device.
No, user interaction is not needed for exploitation, making it particularly dangerous.
If you cannot update, it is advisable to limit the use of Fastboot and avoid operations that could expose your device to potential attacks until the update can be applied.
References
Related vulnerabilities
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