CVE-2023-46139
KernelSU Signature Verification Downgrade Vulnerability ( Privilege Escalation )
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.
INFO
Published Date :
Oct. 31, 2023, 12:15 a.m.
Last Modified :
Nov. 14, 2023, 7:59 p.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
3.7
Exploitability Score :
1.5
References to Advisories, Solutions, and Tools
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CVE-2023-46139.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2023-46139 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-46139 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Nov. 14, 2023
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L Changed Reference Type http://aospxref.com/android-14.0.0_r2/xref/frameworks/base/core/java/android/util/apk/ApkSigningBlockUtils.java#770 No Types Assigned http://aospxref.com/android-14.0.0_r2/xref/frameworks/base/core/java/android/util/apk/ApkSigningBlockUtils.java#770 Third Party Advisory Changed Reference Type http://aospxref.com/android-14.0.0_r2/xref/frameworks/base/core/java/android/util/apk/ApkSigningBlockUtils.java#783 No Types Assigned http://aospxref.com/android-14.0.0_r2/xref/frameworks/base/core/java/android/util/apk/ApkSigningBlockUtils.java#783 Third Party Advisory Changed Reference Type https://drive.google.com/drive/folders/1XdYCCAhC_mkt1k1IyUiwcgFsuOFvwNRl No Types Assigned https://drive.google.com/drive/folders/1XdYCCAhC_mkt1k1IyUiwcgFsuOFvwNRl Third Party Advisory Changed Reference Type https://github.com/tiann/KernelSU/blob/344c08bb79ba12b692016750cda363f9f3500182/kernel/apk_sign.c#L179C32-L179C32 No Types Assigned https://github.com/tiann/KernelSU/blob/344c08bb79ba12b692016750cda363f9f3500182/kernel/apk_sign.c#L179C32-L179C32 Third Party Advisory Changed Reference Type https://github.com/tiann/KernelSU/blob/344c08bb79ba12b692016750cda363f9f3500182/kernel/apk_sign.c#L188 No Types Assigned https://github.com/tiann/KernelSU/blob/344c08bb79ba12b692016750cda363f9f3500182/kernel/apk_sign.c#L188 Third Party Advisory Changed Reference Type https://github.com/tiann/KernelSU/commit/d24813b2c3738f2f9bd762932141cadd948c354f No Types Assigned https://github.com/tiann/KernelSU/commit/d24813b2c3738f2f9bd762932141cadd948c354f Third Party Advisory Changed Reference Type https://github.com/tiann/KernelSU/security/advisories/GHSA-86cp-3prf-pwqq No Types Assigned https://github.com/tiann/KernelSU/security/advisories/GHSA-86cp-3prf-pwqq Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:kernelsu:kernelsu:*:*:*:*:*:*:*:* versions from (including) 0.6.1 up to (excluding) 0.7.0
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-46139 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2023-46139
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.04 }} 0.00%
score
0.08560
percentile