Format string error in iPadOS and Apple iOS - CVE-2021-30800
Published: July 19, 2021 / Updated: July 22, 2021
Vulnerability identifier: #VU54949
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-30800
CWE-ID: CWE-134
Exploitation vector: Adjecent network
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 format string error in the wifid daemon when processing SSID name while connecting to a Wi-Fi hotspot. A remote attacker can supply a specially crafted SSID name that contains format string specifiers and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
iPadOS
Apple iOS
Apple iOS
How to mitigate CVE-2021-30800
Install update from vendor's website.
iPadOS - addressed in versions 14.7 18G69, 14.7 18G70
Apple iOS - update to 14.7 18G69
Apple iOS - update to 14.7 18G69
External References
- https://blog.zecops.com/research/meet-wifidemon-ios-wifi-rce-0-day-vulnerability-and-a-zero-click-vulnerability-that-was-silently-patched/
- https://www.bleepingcomputer.com/news/security/iphone-bug-breaks-wifi-when-you-join-hotspot-with-unusual-name/
- https://blog.chichou.me/2021/06/20/quick-analysis-wifid/
- https://support.apple.com/en-us/HT212601