JVN#10921428
Lemon8 App fails to restrict access permissions
Overview
Lemon8 fails to restrict access permissions.
Products Affected
- Lemon8 App for Android versions prior to 3.3.5
- Lemon8 App for iOS versions prior to 3.3.5
Description
Lemon8 by ByteDance K.K. provides the function to access a requested URL using Custom URL Scheme/DeepLink. The App does not restrict access to the function properly (CWE-939) which may be exploited to direct the App to access any sites.
Impact
A remote attacker may lead a user to access an arbitrary website via the vulnerable App. As a result, the user may become a victim of a phishing attack.
Solution
Update the Application
Update the application to the latest version according to the information provided by the developer.
The developer has released the following versions:
- Lemon8 App for Android version 3.3.5
- Lemon8 App for iOS version 3.3.5
Vendor Status
| Vendor | Link |
| ByteDance K.K. | Google Play Lemon8 (Text in Japanese) |
| App Store Lemon8 (Text in Japanese) |
References
JPCERT/CC Addendum
Vulnerability Analysis by JPCERT/CC
| Attack Vector(AV) | Physical (P) | Local (L) | Adjacent (A) | Network (N) |
|---|---|---|---|---|
| Attack Complexity(AC) | High (H) | Low (L) | ||
| Privileges Required(PR) | High (H) | Low (L) | None (N) | |
| User Interaction(UI) | Required (R) | None (N) | ||
| Scope(S) | Unchanged (U) | Changed (C) | ||
| Confidentiality Impact(C) | None (N) | Low (L) | High (H) | |
| Integrity Impact(I) | None (N) | Low (L) | High (H) | |
| Availability Impact(A) | None (N) | Low (L) | High (H) |
| Access Vector(AV) | Local (L) | Adjacent Network (A) | Network (N) |
|---|---|---|---|
| Access Complexity(AC) | High (H) | Medium (M) | Low (L) |
| Authentication(Au) | Multiple (M) | Single (S) | None (N) |
| Confidentiality Impact(C) | None (N) | Partial (P) | Complete (C) |
| Integrity Impact(I) | None (N) | Partial (P) | Complete (C) |
| Availability Impact(A) | None (N) | Partial (P) | Complete (C) |
Credit
Ryo Sato of BroadBand Security,Inc. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
Other Information
| JPCERT Alert |
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| JPCERT Reports |
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| CERT Advisory |
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| CPNI Advisory |
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| TRnotes |
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| CVE |
CVE-2022-41797 |
| JVN iPedia |
JVNDB-2022-000081 |