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Security Advisories: GSA_kwCzR0hTQS13ZmdqLXdyZ2gtaDNyM84AA6PP

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.

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.

Permalink: https://github.com/advisories/GHSA-wfgj-wrgh-h3r3
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS13ZmdqLXdyZ2gtaDNyM84AA6PP
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: about 1 month ago
Updated: about 1 month ago

CVSS Score: 7.3
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Identifiers: GHSA-wfgj-wrgh-h3r3, CVE-2024-29190
References:

• https://github.com/MobSF/Mobile-Security-Framework-MobSF/security/advisories/GHSA-wfgj-wrgh-h3r3
• https://github.com/MobSF/mobsfscan/commit/61fd40b477bbf9d204eb8c5a83a86c396d839798
• https://github.com/MobSF/mobsfscan/commit/cd01b71770a6e56c1c71b0e5f454e7b6c9c64ef4
• https://nvd.nist.gov/vuln/detail/CVE-2024-29190
• https://github.com/MobSF/Mobile-Security-Framework-MobSF/commit/5a8eeee73c5f504a6c3abdf2a139a13804efdb77
• https://drive.google.com/file/d/1nbKMd2sKosbJef5Mh4DxjcHcQ8Hw0BNR/view?usp=share_link
• https://github.com/advisories/GHSA-wfgj-wrgh-h3r3

Repository: https://github.com/MobSF/Mobile-Security-Framework-MobSF
Blast Radius: 0.0

Affected Packages