Zero-day vulnerability in Apple iOS

Integer overflow
CVE-2011-0226

Exploited in the wild via malicious PDF files.

Vulnerability details

Advisory: SB2011070801 - Multiple vulnerabilities in Apple iOS

Vulnerable component: Apple iOS

CVE-ID: CVE-2011-0226

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

CWE-ID: CWE-190 - Integer overflow

Description:

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

The vulnerability exists due to integer overflow when handling of Type 1 fonts by FreeType. A remote attacker can send a specially crafted PDF file, trick the victim into opening it, trigger memory corruption and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability results in compromise of vulnerable system.

Note: the vulnerability was being actively exploited.

External links:

https://support.apple.com/en-us/HT202272
http://lists.nongnu.org/archive/html/freetype-devel/2011-07/msg00015.html
https://www.trendmicro.com/vinfo/us/threat-encyclopedia/malware/troj_pidief.smxz

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.