Apple iCloud up to 7.3 on Windows WebKit memory corruption

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6.8$0-$5k0.00

A vulnerability was found in Apple iCloud up to 7.3 on Windows (Cloud Software) and classified as critical. This issue affects an unknown part of the component WebKit. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. Impacted is confidentiality, integrity, and availability.

The bug was discovered 03/29/2018. The weakness was published 03/29/2018 by Natalie Silvanovich with Google Project Zero as HT208697 as confirmed advisory (Website). It is possible to read the advisory at support.apple.com. The identification of this vulnerability is CVE-2018-4121 since 01/02/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are unknown but a public exploit is available. The advisory points out:

Multiple memory corruption issues were addressed with improved memory handling.

It is declared as proof-of-concept. The exploit is available at exploit-db.com. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 118453 (openSUSE Security Update : webkit2gtk3 (openSUSE-2018-1288)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context local. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370850 (Apple iTunes for Windows Prior to 12.7.4 Multiple Vulnerabilities.(HT208694)).

Upgrading to version 7.4 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (118453). Similar entries are available at 115296, 115301, 115302 and 115311.

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CVSSv3infoedit

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 6.8

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CVSSv2infoedit

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VulDB Base Score: 🔍
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Exploitinginfoedit

Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 118453
Nessus Name: openSUSE Security Update : webkit2gtk3 (openSUSE-2018-1288)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 53931
OpenVAS Name: Apple iCloud Security Updates(HT208697)-Windows
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfoedit

Threat: 🔍
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Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

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

Upgrade: iCloud 7.4

Timelineinfoedit

01/02/2018 🔍
03/29/2018 +86 days 🔍
03/29/2018 +0 days 🔍
03/29/2018 +0 days 🔍
03/31/2018 +2 days 🔍
04/03/2018 +3 days 🔍
10/26/2018 +206 days 🔍
06/03/2020 +586 days 🔍

Sourcesinfoedit

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

Advisory: HT208697
Researcher: Natalie Silvanovich
Organization: Google Project Zero
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-4121 (🔍)
scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfoedit

Created: 03/31/2018 09:53 PM
Updated: 06/03/2020 12:29 PM
Changes: (16) vulnerability_discoverydate advisory_confirm_url exploit_availability exploit_publicity exploit_url source_cve_assigned source_cve_nvd_published source_exploitdb source_nessus_id source_nessus_name source_nessus_filename source_nessus_family source_openvas_id source_openvas_filename source_openvas_title source_openvas_family
Complete: 🔍

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