Privileged content-provider access via redirected intent
Published Jun 11, 2021 · Updated Aug 3, 2024
Intent redirection in Samsung Secure Folder on Android 11 before SMR MAY-2021 Release 1 allows local users to execute privileged actions. KnoxSettingCheckLockTypeActivity returns an attacker-supplied content URI with Secure Folder's read and write grants instead of restricting the caller. An unprivileged application on the device can invoke the activity and use the returned grants to read or write protected provider data, as demonstrated against contacts.
Summary
What happened
Intent redirection in Samsung Secure Folder on Android 11 before SMR MAY-2021 Release 1 allows local users to execute privileged actions. KnoxSettingCheckLockTypeActivity returns an attacker-supplied content URI with Secure Folder's read and write grants instead of restricting the caller. An unprivileged application on the device can invoke the activity and use the returned grants to read or write protected provider data, as demonstrated against contacts.
The record
- CVE
- CVE-2021-25391
- Published
- Jun 11, 2021
- Updated
- Aug 3, 2024
- Vendor
- Samsung Electronics Co., Ltd.
- Product
- Samsung Mobile Devices
- Classifications
- CWE-926, T1068
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 11, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=R(11.0) <SMR MAY-2021 Release 1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Secure Folder content-provider grant interception proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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