SB2021092317 - Multiple vulnerabilities in Apple iOS 12

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Main Vulnerability Database SB2021092317

SB2021092317 - Multiple vulnerabilities in Apple iOS 12

Published: September 23, 2021 Updated: December 26, 2021

Security Bulletin ID SB2021092317
CSH Severity
Critical
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Critical 67% High 33%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


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

CWE-ID: CWE-190 - Integer overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red


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)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red


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)

CWE-ID: CWE-843 - Type confusion

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber


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