CVE-2020-27918: Use After Free

Published Nov 5, 2020
·
Updated

A flaw was found in WebKitGTK.

Impact: Processing maliciously crafted web content may lead to arbitrary code execution. Description: A use after free issue was addressed with improved memory management.

Reference: https://webkitgtk.org/security/WSA-2021-0002.html

Other sources

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 14.2 and iPadOS 14.2, iCloud for Windows 11.5, Safari 14.0.1, tvOS 14.2, iTunes 12.11 for Windows. Processing maliciously crafted web content may lead to arbitrary code execution.

— MITRE

WebKit. A use after free issue was addressed with improved memory management.

Credit

Liu Long(Ant Security Light), an anonymous researcher, cc(Trend Micro Zero Day Initiative), Marcin 'Icewall' Noga(Cisco Talos)

Affected Software

30 affected componentsFixes available
Apple macOS Big Sur<11.0.1
11.0.1
Apple tvOS<14.2
14.2
Apple WatchOS<7.1
7.1
Apple iCloud for Windows<11.5
11.5
Apple iTunes for Windows<12.11
12.11
Apple Safari<14.0.1
14.0.1
Apple iOS<14.2
14.2
Apple iPadOS<14.2
14.2
Apple Icloud Windows<11.5
Apple Itunes Windows<12.11
Apple Safari<14.0.1
Apple iPadOS<14.2
Apple iPhone OS<14.2
Apple macOS<11.0.1
Apple tvOS<14.2
Apple WatchOS<7.1
Fedoraproject Fedora=32
Fedoraproject Fedora=33
Fedoraproject Fedora=34
Debian Debian Linux=10.0
WebKitGTK Webkitgtk\+<2.30.6
redhat/webkitgtk<2.30.6
2.30.6
alpine/webkit2gtk<2.30.6-r0
2.30.6-r0
alpine/webkit2gtk<2.30.6-r0
2.30.6-r0
alpine/webkit2gtk<2.30.6-r0
2.30.6-r0
alpine/webkit2gtk<2.30.6-r0
2.30.6-r0
alpine/webkit2gtk<2.30.6-r0
2.30.6-r0
alpine/webkit2gtk<2.30.6-r0
2.30.6-r0
alpine/webkit2gtk<2.30.6-r0
2.30.6-r0
alpine/webkit2gtk<2.30.6-r0
2.30.6-r0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade Apple macOS to a version that resolves this vulnerability.

    Fixed in 11.0.1
  2. Upgrade

    Upgrade tvOS to a version that resolves this vulnerability.

    Fixed in 14.2
  3. Upgrade

    Upgrade Apple iOS, iPadOS, and watchOS to a version that resolves this vulnerability.

    Fixed in 7.1
  4. Upgrade

    Upgrade Apple iCloud to a version that resolves this vulnerability.

    Fixed in 11.5
  5. Upgrade

    Upgrade iTunes to a version that resolves this vulnerability.

    Fixed in 12.11
  6. Upgrade

    Upgrade Safari to a version that resolves this vulnerability.

    Fixed in 14.0.1
  7. Upgrade

    Upgrade Apple iOS and iPadOS to a version that resolves this vulnerability.

    Fixed in 14.2
  8. Upgrade

    Upgrade Apple iOS, iPadOS, and macOS to a version that resolves this vulnerability.

    Fixed in 14.2
  9. Upgrade

    Upgrade redhat/webkitgtk to a version that resolves this vulnerability.

    Fixed in 2.30.6
  10. Upgrade

    Upgrade alpine/webkit2gtk to a version that resolves this vulnerability.

    Fixed in 2.30.6-r0
  11. Upgrade

    Upgrade macOS Big Sur to a version that resolves this vulnerability.

    Fixed in 11.0.1
  12. Upgrade

    Upgrade watchOS to a version that resolves this vulnerability.

    Fixed in 7.1
  13. Upgrade

    Upgrade iOS to a version that resolves this vulnerability.

    Fixed in 14.2
  14. Upgrade

    Upgrade iPadOS to a version that resolves this vulnerability.

    Fixed in 14.2
  15. Upgrade

    Upgrade iCloud for Windows to a version that resolves this vulnerability.

    Fixed in 11.5
  16. Upgrade

    Upgrade iTunes for Windows to a version that resolves this vulnerability.

    Fixed in 12.11

Event History

Dec 8, 2020
CVE Published
via MITRE·09:11 PM
Data Sourced
via MITRE·09:11 PM
DescriptionWeakness
Data Sourced
via NVD·10:15 PM
DescriptionSeverityWeaknessAffected Software
Data Sourced
via OSV·10:15 PM
DescriptionSeverityAffected Software
Mar 29, 2021
Data Sourced
via Red Hat·06:27 PM
DescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is CVE-2020-27918?

CVE-2020-27918 is a use after free vulnerability in WebKit.

2

How does CVE-2020-27918 impact Apple iCloud for Windows?

Apple iCloud for Windows version 11.5 is affected by CVE-2020-27918.

3

Is Apple iTunes for Windows affected by CVE-2020-27918?

Yes, Apple iTunes for Windows version up to 12.11 is affected by CVE-2020-27918.

4

What is the severity of CVE-2020-27918?

The severity of CVE-2020-27918 is not specified in the vulnerability report.

5

How can I fix CVE-2020-27918?

To fix CVE-2020-27918, update to the latest version of the affected software as per the vendor's instructions.

Company

Resources

Contact

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