eGain Chat 15.5.5 Cross Site Scripting

2021.08.01
Risk: Low
Local: No
Remote: Yes
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

# Exploit Title: eGain Chat 15.5.5 Cross-Site Scripting # Vendor Homepage: https://www.egain.com/ # Software Link: https://www.egain.com/chat-software/ # Exploit Authors: Brandon Ming Yang Ho (https://www.linkedin.com/in/minhobrandon/), Hassy Vinod Eshan (https://www.linkedin.com/in/hassy-vinod/) # CVE: CVE-2020-15948 # Timeline - June 2020: Initial vulnerability discovery - July 2020: Reported to eGain Corporation - August 2020: Fix/patch provided by eGain Corporation - September 2020: Public disclosure notified to eGain Corporation - July 2021: Published CVE-2020-15948 # 1. Introduction eGain Chat is a real time chat assistance solution by eGain Corporation for website visitors to communicate with chat agents. # 2. Vulnerability Details eGain Chat version 15.5.5 is vulnerable to reflected Cross-Site Scripting (Reflected XSS). The “Name” input field (full_name) does not fully sanitise user input for special characters such as “<” or “>” and HTML attributes such as “<a href>”. It is possible for an attacker to bypass filtering and create malicious scripts. Once the response has been rendered, the malicious JavaScript code would be executed. # 3. Proof of Concept The “Name” input field (full_name) of the chat window can be injected with the following XSS payload as a Proof of Concept to execute a javascript alert popup. Payload - <a href="javascript&#58alert(document.domain)">click</a> # 4. Remediation Apply the latest fix/patch from eGain Corporation. # 5. Credits - Brandon Ming Yang Ho (https://www.linkedin.com/in/minhobrandon/) - Hassy Vinod Eshan (https://www.linkedin.com/in/hassy-vinod/)


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