Heap-based buffer overflow in macOS - CVE-2021-1883
Published: April 27, 2021
Vulnerability identifier: #VU52657
CSH Severity: Medium
CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-1883
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in Heimdal when processing server messages. A remote attacker can trick the user to connect to a malicious server, send a specially crafted message, trigger heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
macOS
watchOS
tvOS
iPadOS
Apple iOS
watchOS
tvOS
iPadOS
Apple iOS
How to mitigate CVE-2021-1883
Install updates from vendor's website.
macOS - addressed in versions 11.3 20E232, 10.14.6 18G9216, 10.15.7 19H1217
watchOS - update to 7.4 18T195
tvOS - update to 14.5 18L204
iPadOS - update to 14.5 18E199
Apple iOS - update to 14.5 18E199
watchOS - update to 7.4 18T195
tvOS - update to 14.5 18L204
iPadOS - update to 14.5 18E199
Apple iOS - update to 14.5 18E199