JVN#03447226
"Skylark" App fails to restrict custom URL schemes properly
Overview
"Skylark" App fails to restrict custom URL schemes properly.
Products Affected
- "Skylark" App for Android versions 6.2.13 and earlier
- "Skylark" App for iOS versions 6.2.13 and earlier
Description
"Skylark" App provided by SKYLARK HOLDINGS CO., LTD. provides the function to access a requested URL using Custom URL Scheme. 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
An arbitrary site may be displayed on the WebView of the product by using another application installed on the user's device. As a result, the user may be redirected to a malicious site.
Solution
Update the application
Update the application to the latest version according to the information provided by the developer.
Vendor Status
| Vendor | Status | Last Update | Vendor Notes |
|---|---|---|---|
| SKYLARK HOLDINGS CO., LTD. | Vulnerable | 2023/11/01 |
| Vendor | Link |
| SKYLARK HOLDINGS CO., LTD. | "Skylark" App for Android (Text in Japanese) |
| "Skylark" App for iOS (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) |
Comment
The messaging mechanism within the device is used, hence Attack Vector is evaluated as Local (AV:L) in CVSSv3.
Credit
Shunsuke Kaneko of Mitsui Bussan Secure Directions, 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-2023-40530 |
| JVN iPedia |
JVNDB-2023-000085 |
Update History
- 2023/11/01
- SKYLARK HOLDINGS CO., LTD. update status