Vulnerability Information
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Vulnerability Title
KernelSU signature validation mismatch
Vulnerability Description
KernelSU is a Kernel based root solution for Android. Starting in version 0.6.1 and prior to version 0.7.0, if a KernelSU installed device is infected with a malware whose app signing block specially constructed, it can take over root privileges on the device. The vulnerable verification logic actually obtains the signature of the last block with an id of `0x7109871a`, while the verification logic during Android installation is to obtain the first one. In addition to the actual signature upgrade that has been fixed (KSU thought it was V2 but was actually V3), there is also the problem of actual signature downgrading (KSU thought it was V2 but was actually V1). Find a condition in the signature verification logic that will cause the signature not to be found error, and KernelSU does not implement the same conditions, so KSU thinks there is a V2 signature, but the APK signature verification actually uses the V1 signature. This issue is fixed in version 0.7.0. As workarounds, keep the KernelSU manager installed and avoid installing unknown apps.
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L
Vulnerability Type
授权机制不正确
Vulnerability Title
KernelSU 安全漏洞
Vulnerability Description
kernelsu是一种基于内核的Android设备获取root权限的方案。 KernelSU 0.6.1至0.7.0之前版本存在安全漏洞，该漏洞源于允许攻击者通过构建应用程序signing block利用恶意软件接管设备上的root权限。
CVSS Information
N/A
Vulnerability Type
N/A