SB2021092317 - Multiple vulnerabilities in Apple iOS 12

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Integer overflow (CVE-ID: CVE-2021-30860)

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.

2) Use-after-free (CVE-ID: CVE-2021-30858)

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when processing HTML content in WebKit. A remote attacker can trick the victim to visit a specially crafted web page, trigger a use-after-free error and execute arbitrary code on the system.

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

Note, the vulnerability is being actively exploited in-the-wild.

3) Type Confusion (CVE-ID: CVE-2021-30869)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a type confusion error within the XNU subsystem. A local user can run a specially crafted program to trigger a type confusion error and execute arbitrary code with elevated privileges.

Note, the vulnerability is being actively exploited in the wild.

Remediation

Install update from vendor's website.

References

• https://support.apple.com/en-us/HT212824