Zero-day vulnerability in Apple iOS

Integer overflow
CVE-2021-30860

The vulnerability is believed to be used against Bahraini activists.

Known malware:

FORCEDENTRY

Vulnerability details

Advisory: SB2021082501 - Remote code execution in Apple iOS

Vulnerable component: Apple iOS

CVE-ID: CVE-2021-30860

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H/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 processing PDF files within the CoreGraphics component. A remote attacker can trick the victim to open a specially crafted PDF file, trigger integer overflow and execute arbitrary code on the target system.

Note, the vulnerability is being active exploited in-the-wild via the FORCEDENTRY tool against Bahraini activists.

External links:

https://citizenlab.ca/2021/08/bahrain-hacks-activists-with-nso-group-zero-click-iphone-exploits/

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.