Yourls 1.7 Cross Site Scripting

2014-10-28 / 2015-04-19

Credit: Alvaro Diaz

Risk: Low

Local: No

Remote: Yes

CVE: CVE-2014-8488

CWE: CWE-79

CVSS Base Score: 4.3/10

Impact Subscore: 2.9/10

Exploitability Subscore: 8.6/10

Exploit range: Remote

Attack complexity: Medium

Authentication: No required

Confidentiality impact: None

Integrity impact: Partial

Availability impact: None

Hello, I found a xss stored vulnerability in Yourls 1.7 script (latest
version).

The attacker can steal the admin's cookies and login in the admin panel.

Note: Only the admin can see this.

Steps to perform the vulnerability:

1. Create a new url to shorten --> In the inputs you need write this
payload --> anything"><img src=x onerror=prompt(1)>*

* Javascript code to inject.

2. Click in the button "Shorten"

3. Wait until the administrator logs in the admin panel

Screenshoots:

1.  http://i.imgur.com/G4r6uV0.png

2. http://i.imgur.com/jhGR4n2.png

3. http://i.imgur.com/gQYSqgt.png

Thank You, Kind Regards.

See this note in RAW Version

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Yourls 1.7 Cross Site Scripting

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