CVE-2021-30703 - Double Free

Severity

78%

Complexity

18%

Confidentiality

98%

A double free issue was addressed with improved memory management. This issue is fixed in tvOS 14.6, iOS 14.6 and iPadOS 14.6, Security Update 2021-004 Catalina, Security Update 2021-005 Mojave, macOS Big Sur 11.4, watchOS 7.5. An application may be able to execute arbitrary code with kernel privileges.

CVSS 3.1 Base Score 7.8. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 7.2. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:C/I:C/A:C).

Demo Examples

Double Free

CWE-415

Double Free

CWE-415

While contrived, this code should be exploitable on Linux distributions which do not ship with heap-chunk check summing turned on.


               
}
free(buf1R2);

Overview

First reported 3 years ago

2021-09-08 15:15:00

Last updated 3 years ago

2021-09-17 18:40:00

Affected Software

Apple Mac OS X

References

https://support.apple.com/en-us/HT212529

https://support.apple.com/en-us/HT212528

https://support.apple.com/en-us/HT212603

https://support.apple.com/en-us/HT212600

https://support.apple.com/en-us/HT212532

https://support.apple.com/en-us/HT212533

https://support.apple.com/en-us/HT212529

Vendor Advisory

https://support.apple.com/en-us/HT212528

Vendor Advisory

https://support.apple.com/en-us/HT212603

Vendor Advisory

https://support.apple.com/en-us/HT212600

Vendor Advisory

https://support.apple.com/en-us/HT212532

Vendor Advisory

https://support.apple.com/en-us/HT212533

Vendor Advisory

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