Zero-day vulnerability in Apple iOS

Memory corruption
CVE-2016-4657

The Citizen Lab discovery exposed three zero-day exploits ((CVE-2016-4655, CVE-2016-4656, CVE-2016-4657)) used by тАЬPegasusтАЭ, a lawful interception cyberespionage tool developed by the Israeli-based NSO Group and sold to government agencies (UAE Human Rights Defender (Ahmed Mansoor)).

Known malware:

Trident exploit.

Vulnerability details

Advisory: SB2016082402 - Multiple vulnerabilities in Apple iOS

Vulnerable component: Apple iOS

CVE-ID: CVE-2016-4657

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

CWE-ID: CWE-119 - Memory corruption

Description:

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

The vulnerability exists due to boundary error in WebKit. A remote attacker can create a specially crafted Web site, trick the victim into visiting it, trigger memory corruption and execute arbitrary code with privileges of the current user.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: the vulnerability was being actively exploited.

Known APT campaigns:

UAE Human Rights Defender Ahmed Mansoor breach

Trident was used to install тАЬPegasusтАЭ, a lawful interception cyberespionage tool developed by the Israeli-based NSO Group and sold to government agencies.

Public Exploits:

- Nintendo Switch - WebKit Code Execution (PoC) [Exploit-DB]

External links:

http://www.securityweek.com/apple-issues-emergency-fix-ios-zero-days-what-you-need-know
https://www.symantec.com/connect/blogs/trident-trio-ios-zero-days-being-exploited-wild
https://citizenlab.org/2016/08/million-dollar-dissident-iphone-zero-day-nso-group-uae/
https://jndok.github.io/2016/10/04/pegasus-writeup/
https://blog.lookout.com/blog/2016/08/25/trident-pegasus/
http://securityaffairs.co/wordpress/50788/mobile-2/ios-9-3-4-trident-exploit.html
https://citizenlab.org/2016/08/million-dollar-dissident-iphone-zero-day-nso-group-uae/
https://en.wikipedia.org/wiki/Pegasus_(spyware)
http://indianexpress.com/article/technology/tech-news-technology/apple-ios-trident-exploit-all-you-n...
http://www.technewsworld.com/story/83845.html
http://www.eweek.com/security/apple-rushes-out-patch-for-new-ios-zero-day-flaws.html
http://www.darkreading.com/vulnerabilities---threats/apple-releases-patch-for-trident-a-trio-of-ios-...

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.