Apple iCloud up to 11.4 on Windows libxml2 integer overflow

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6.7	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Apple iCloud up to 11.4 on Windows and classified as critical. Affected by this vulnerability is an unknown functionality of the component libxml2. Such manipulation leads to integer overflow. This vulnerability is listed as CVE-2020-27911. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Apple iCloud up to 11.4 on Windows (Cloud Software). Affected by this issue is an unknown code of the component libxml2. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability.

The weakness was presented 12/02/2020 by OSS-Fuzz as HT211935 as confirmed advisory (Website). The advisory is available at support.apple.com. This vulnerability is handled as CVE-2020-27911. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The advisory points out:

A remote attacker may be able to cause unexpected application termination or arbitrary code execution

Upgrading to version 11.5 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 through improved input validation.

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Productinfo

Type

Cloud Software

Vendor

Apple

Name

iCloud

Version

License

free

Website

Vendor: https://www.apple.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.9

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

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: iCloud 11.5

Timelineinfo

10/27/2020 🔍
12/02/2020 +36 days 🔍
12/02/2020 +0 days 🔍
12/06/2020 +4 days 🔍
12/13/2020 +6 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT211935
Researcher: OSS-Fuzz
Status: Confirmed

CVE: CVE-2020-27911 (🔍)
GCVE (CVE): GCVE-0-2020-27911
GCVE (VulDB): GCVE-100-165638

Entryinfo

Created: 12/06/2020 17:43
Updated: 12/13/2020 00:42
Changes: 12/06/2020 17:43 (19), 12/06/2020 17:46 (28), 12/13/2020 00:36 (5), 12/13/2020 00:42 (18)
Complete: 🔍
Cache ID: 216::103