Zero-day vulnerability in Mozilla Firefox

Cross-site scripting
CVE-2009-1308

The vulnerability was exploited against eBay customers in March 2009.

Vulnerability details

Advisory: SB2009030401 - XSS in Mozilla Firefox

Vulnerable component: Mozilla Firefox

CVE-ID: CVE-2009-1308

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Description:

The vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient validation of user-supplied input when processing XBL bindings. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in userтАЩs browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Note: the vulnerability was being actively exploited.

External links:

https://www.mozilla.org/en-US/security/advisories/mfsa2009-18/
http://www.theregister.co.uk/2009/03/08/ebay_scam_wizardy/

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.