Apple iOS/iPadOS up to 15.0.2 WebKit buffer overflow

Summaryinfo

A vulnerability identified as critical has been detected in Apple iOS and iPadOS up to 15.0.2. This affects an unknown part of the component WebKit. The manipulation leads to buffer overflow. This vulnerability is referenced as CVE-2021-30889. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Apple iOS and iPadOS up to 15.0.2 (Smartphone Operating System) and classified as critical. This issue affects some unknown functionality of the component WebKit. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability.

The weakness was published 10/25/2021 by Chijin Zhou as HT212867 as confirmed advisory (Website). It is possible to read the advisory at support.apple.com. The identification of this vulnerability is CVE-2021-30889. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 05/22/2025). It is expected to see the exploit prices for this product increasing in the near future. The advisory points out:

Processing maliciously crafted web content may lead to arbitrary code execution

The vulnerability scanner Nessus provides a plugin with the ID 236537 (Alibaba Cloud Linux 3 : 0162: webkit2gtk3 (ALINUX3-SA-2022:0162)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 15.1 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

A buffer overflow issue was addressed with improved memory handling.

The vulnerability is also documented in the vulnerability database at Tenable (236537). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Smartphone Operating System

Vendor

• Apple

Name

• iOS
• iPadOS

Version

• 15.0.0
• 15.0.1
• 15.0.2

License

• commercial

Website

• Vendor: https://www.apple.com/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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