SSRF Vulnerability on assetlinks_check(act_name, well_knowns)
Summary
While examining the "App Link assetlinks.json file could not be found" vulnerability detected by MobSF, we, as the Trendyol Application Security team, noticed that a GET request was sent to the "/.well-known/assetlinks.json" endpoint for all hosts written with "android:host". In the AndroidManifest.xml file.
Since MobSF does not perform any input validation when extracting the hostnames in "android:host", requests can also be sent to local hostnames. This may cause SSRF vulnerability.
Details
Example <intent-filter structure in AndroidManifest.xml:
<intent-filter android:autoVerify="true">
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data android:host="192.168.1.102/user/delete/1#" android:scheme="http" />
</intent-filter>We defined it as android:host="192.168.1.102/user/delete/1#". Here, the "#" character at the end of the host prevents requests from being sent to the "/.well-known/assetlinks.json" endpoint and ensures that requests are sent to the endpoint before it.
<img width="617" alt="image" src="https://github.com/MobSF/Mobile-Security-Framework-MobSF/assets/150332295/c570cb00-e947-4ad7-af80-26d46c0ad3f7">PoC
https://drive.google.com/file/d/1nbKMd2sKosbJef5Mh4DxjcHcQ8Hw0BNR/view?usp=share_link
Impact
The attacker can cause the server to make a connection to internal-only services within the organization's infrastructure.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | mobsf | < 3.9.7 | 3.9.7 |
| Python (PyPI) | mobsfscan | < 0.3.8 | 0.3.8 |
References
- https://github.com/MobSF/Mobile-Security-Framework-MobSF/security/advisories/GHSA-wfgj-wrgh-h3r3
- https://nvd.nist.gov/vuln/detail/CVE-2024-29190
- https://github.com/MobSF/Mobile-Security-Framework-MobSF/commit/5a8eeee73c5f504a6c3abdf2a139a13804efdb77
- https://github.com/MobSF/mobsfscan/commit/61fd40b477bbf9d204eb8c5a83a86c396d839798
- https://github.com/MobSF/mobsfscan/commit/cd01b71770a6e56c1c71b0e5f454e7b6c9c64ef4
- https://drive.google.com/file/d/1nbKMd2sKosbJef5Mh4DxjcHcQ8Hw0BNR/view?usp=share_link
- https://github.com/MobSF/Mobile-Security-Framework-MobSF
- https://github.com/pypa/advisory-database/tree/main/vulns/mobsf/PYSEC-2024-257.yaml
- https://pypi.org/project/mobsfscan
- https://github.com/advisories/GHSA-wfgj-wrgh-h3r3
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L- Weakness (CWE)
CWE-918- Platform
- Python (PyPI)
- Package
mobsf, mobsfscan- Disclosed
- 22.03.2024
- Updated
- 11.10.2026 13:19
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2024-257 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-wfgj-wrgh-h3r3 - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-1677 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: mobsf
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 22
- First → latest
- 10.2022 08.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 9
- Medium 11
- Low 2
Disclosures per year
- 2022: 1
- 2023: 1
- 2024: 6
- 2025: 8
- 2026: 6
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SSRF Vulnerability on assetlinks_check(act_name, well_knowns) this entry
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