Shaarli 0.9.1 index.php searchtags Reflected cross site scripting

Summaryinfo

A vulnerability described as problematic has been identified in Shaarli 0.9.1. This issue affects some unknown processing of the file index.php. Such manipulation of the argument searchtags as part of Parameter leads to cross site scripting (Reflected). This vulnerability is uniquely identified as CVE-2017-15215. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Shaarli 0.9.1 and classified as problematic. Affected by this issue is an unknown code block of the file index.php. The manipulation of the argument searchtags as part of a Parameter leads to a cross site scripting vulnerability (Reflected). Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes:

Reflected XSS vulnerability in Shaarli v0.9.1 allows an unauthenticated attacker to inject JavaScript via the searchtags parameter to index.php. If the victim is an administrator, an attacker can (for example) take over the admin session or change global settings or add/delete links. It is also possible to execute JavaScript against unauthenticated users.

The bug was discovered 10/07/2017. The weakness was disclosed 10/11/2017 (Website). The advisory is shared for download at openwall.com. This vulnerability is handled as CVE-2017-15215 since 10/10/2017. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k. By approaching the search of inurl:index.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• Shaarli

Version

• 0.9.1

Website

• Product: https://github.com/shaarli/Shaarli/

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