Zero-day Vulnerability Database

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Zero-day vulnerabilities discovered: 3

Security bypass in Mozilla Firefox
CVE-2015-4495

Security bypass

The vulnerabiity allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to improper input validation. A remote attacker can create a specially crafted PDF file, trick the victim into opening it, bypass same-origin policy and inject arbitrary JavaScript into the built-in PDF Viewer to gain access to arbitrary files on the system.

Successful exploitation of this vulnerability may result in access to local files and privilege escalation, leading to system compromise.

Note: the vulnerability was being actively exploited.
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In August 2016 Mozilla bug-tracking service was hacked. Hackers were able to steal information about not yet patched vulnerabilities in Mozilla Firefox and use one of them in a targeted attack against users of Russian news website.

The malicious exfiltration server, hosted in Ukraine, has been online since July 27, 2015.

The vulnerability was reported by researcher Cody Crews.

Software: Mozilla Firefox

Known/fameous malware:

JS/Exploit.CVE-2015-4495 (ESET).

In August 2016 Mozilla bug-tracking service was hacked. Hackers were able to steal information about not yet patched vulnerabilities in Mozilla Firefox and use one of them in a targeted attack against users of Russian news website.

The malicious exfiltration server, hosted in Ukraine, has been online since July 27, 2015.

The vulnerability was reported by researcher Cody Crews.

Remote code execution in Mozilla Firefox
CVE-2010-3765

Heap-based buffer overflow

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to boundary error within nsCSSFrameConstructor::ContentAppended. A remote attacker can create a specially crafted web page containing specially crafted document.write and appendChild calls, cause heap-based buffer overflow and execute arbitrary code on the target system with privileges of the current user.

Successful exploitation of this vulnerability may allow an attacker to compromise vulnerable system.

Note: this vulnerability is being actively exploited.

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The vulnerability was reported by Morten Kråkvik of Telenor SOC (a Norwegian security vendor). The Nobel Peace Prize website was serving on October 25, 2010 a zero-day exploit against Firefox users. When people accessed the Nobel Peace Prize site they were diverted onto an attack server located in Taiwan which delivered a JavaScript exploit.

Software: Mozilla Firefox

Known/fameous malware:

Exploit: Belmoo Trojan.

The vulnerability was reported by Morten Kråkvik of Telenor SOC (a Norwegian security vendor). The Nobel Peace Prize website was serving on October 25, 2010 a zero-day exploit against Firefox users. When people accessed the Nobel Peace Prize site they were diverted onto an attack server located in Taiwan which delivered a JavaScript exploit.

XSS in Mozilla Firefox
CVE-2009-1308

Cross-site scripting

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 user’s 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.
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The vulnerability was exploited against eBay customers in March 2009.

Software: Mozilla Firefox

The vulnerability was exploited against eBay customers in March 2009.

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