Doorkeeper up to 4.2.5 OAuth App Form Stored cross site scripting

Summaryinfo

A vulnerability was found in Doorkeeper up to 4.2.5. It has been rated as problematic. Affected is an unknown function of the component OAuth App Form. The manipulation leads to cross site scripting (Stored). This vulnerability is listed as CVE-2018-1000088. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Doorkeeper up to 4.2.5. It has been rated as problematic. This issue affects an unknown function of the component OAuth App Form. The manipulation with an unknown input leads to a cross site scripting vulnerability (Stored). 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. The summary by CVE is:

Doorkeeper version 2.1.0 through 4.2.5 contains a Cross Site Scripting (XSS) vulnerability in web view's OAuth app form, user authorization prompt web view that can result in Stored XSS on the OAuth Client's name will cause users interacting with it will execute payload. This attack appear to be exploitable via The victim must be tricked to click an opaque link to the web view that runs the XSS payload. A malicious version virtually indistinguishable from a normal link.. This vulnerability appears to have been fixed in 4.2.6, 4.3.0.

The bug was discovered 02/21/2018. The weakness was presented 03/13/2018 as not defined mailinglist post (Full-Disclosure). It is possible to read the advisory at seclists.org. The identification of this vulnerability is CVE-2018-1000088 since 02/21/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 20 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 233551 (Ubuntu 16.04 LTS : Doorkeeper vulnerabilities (USN-7394-1)), which helps to determine the existence of the flaw in a target environment.

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

The vulnerability is also documented in the vulnerability database at Tenable (233551). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• Doorkeeper

Version

• 4.2.0
• 4.2.1
• 4.2.2
• 4.2.3
• 4.2.4
• 4.2.5

CPE 2.3info

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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