Apple iOS/iPadOS up to 12.5.2/14.5.0 WebKit integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.0$5k-$25k0.00

A vulnerability classified as critical was found in Apple iOS and iPadOS up to 12.5.2/14.5.0 (Smartphone Operating System). Affected by this vulnerability is an unknown functionality of the component WebKit. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was released 05/03/2021 as HT212341 as confirmed advisory (Website). It is possible to read the advisory at support.apple.com. This vulnerability is known as CVE-2021-30663. It demands that the victim is doing some kind of user interaction. Technical details are unknown but a private exploit is available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 05/06/2021). 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. Apple is aware of a report that this issue may have been actively exploited.

It is declared as highly functional. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 11/03/2021 with a due date of 11/17/2021:

Apply updates per vendor instructions.

Upgrading to version 12.5.3 or 14.5.1 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

An integer overflow was addressed with improved input validation.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Access: Private
Status: Highly functional

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EPSS Percentile: 🔍

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KEV Remediation: 🔍
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Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: iOS/iPadOS 12.5.3/14.5.1

Timelineinfo

04/13/2021 🔍
05/03/2021 +20 days 🔍
05/03/2021 +0 days 🔍
05/06/2021 +3 days 🔍
05/09/2021 +3 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT212341
Status: Confirmed

CVE: CVE-2021-30663 (🔍)
scip Labs: https://www.scip.ch/en/?labs.20150917

Entryinfo

Created: 05/06/2021 09:10
Updated: 05/09/2021 06:45
Changes: 05/06/2021 09:10 (15), 05/06/2021 09:14 (33), 05/09/2021 06:45 (1)
Complete: 🔍

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