CVE-2021-30795: Use After Free

Published Jul 19, 2021
·
Updated

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

Other sources

ActionKit. An input validation issue was addressed with improved input validation.

— Apple

AMD Kernel. A memory corruption issue was addressed with improved input validation.

— Apple

Analytics. A logic issue was addressed with improved restrictions.

— Apple

Analytics. This issue was addressed with a new entitlement.

— Apple

App Store. A permissions issue was addressed with improved validation.

— Apple

Credit

Sergei Glazunov(Google Project Zero), Zachary Keffaber@@QuickUpdate5, Denis Tokarev@@illusionofcha0s, tr3e, George Nosenko, JunDong Xie(Ant Security Light), ryuzaki, Mickey Jin@@patch1t(Trend Micro), Sunglin(Knownsec 404 team), Yizhuo Wang(Group of Software Security In Progress), Tim Michaud@@TimGMichaud(Zoom Video Communications), Linus Henze (pinauten.de), Csaba Fitzl@@theevilbit(Offensive Security), tr3e(Trend Micro Zero Day Initiative), hjy79425575(Trend Micro Zero Day Initiative), Matthew Denton(Google Chrome Security), Jzhu(Baidu Security), Ye Zhang@@co0py_Cat(Baidu Security), CFF(Topsec Alpha Team), CVE-2021-3518, CVE-2018-25010, CVE-2018-25011, CVE-2018-25014, CVE-2020-36328, CVE-2020-36329, CVE-2020-36330, CVE-2020-36331, Anonymous(Trend Micro Zero Day Initiative), Christoph Guttandin(Media Codings), Ivan Fratric(Google Project Zero), vm_call, Nozhdar Abdulkhaleq Shukri, Mickey Jin@@patch1t(Trend Micro working with Trend Micro Zero Day Initiative), Georgi Valkov (httpstorm.com), Zhongcheng Li (CK01), Ron Waisberg@@epsilan, Gary Nield(ECSC Group plc), Wojciech Reguła@@_r3ggi(SecuRing), Matt Shockley (twitter.com/mattshockl)(Offensive Security), Liu Long(Ant Security Light), Yinyi Wu@@3ndy1(Qihoo 360 Vulcan Team), Zuozhi Fan@@pattern_F_(Ant Security TianQiong Lab), ABC Research s.r.o

Affected Software

21 affected componentsFixes available
debian/webkit2gtk
2.36.4-1~deb10u12.38.6-0+deb10u12.40.5-1~deb11u12.42.1-1~deb11u22.40.5-1~deb12u12.42.1-1~deb12u12.42.1-2
debian/wpewebkit
2.38.6-1~deb11u12.38.6-12.42.1-1
Apple macOS Big Sur<11.5
11.5
Apple tvOS<14.7
14.7
Apple WatchOS<7.6
7.6
Apple Safari<14.1.2
14.1.2
Apple Safari<14.1.2
Apple iPhone OS<14.7
Apple macOS>=11.0<11.5
Apple tvOS<14.7
Apple WatchOS<7.6
redhat/webkitgtk<2.32.3
2.32.3
Apple iOS<14.7
14.7
Apple iPadOS<14.7
14.7
alpine/webkit2gtk<2.32.3-r0
2.32.3-r0
alpine/webkit2gtk<2.32.3-r0
2.32.3-r0
alpine/webkit2gtk<2.32.3-r0
2.32.3-r0
alpine/webkit2gtk<2.32.3-r0
2.32.3-r0
alpine/webkit2gtk<2.32.3-r0
2.32.3-r0
alpine/webkit2gtk<2.32.3-r0
2.32.3-r0
alpine/webkit2gtk<2.32.3-r0
2.32.3-r0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 2.36.4-1~deb10u1Fixed in 2.38.6-0+deb10u1Fixed in 2.40.5-1~deb11u1Fixed in 2.42.1-1~deb11u2Fixed in 2.40.5-1~deb12u1Fixed in 2.42.1-1~deb12u1Fixed in 2.42.1-2
  2. Upgrade

    Upgrade debian/wpewebkit to a version that resolves this vulnerability.

    Fixed in 2.38.6-1~deb11u1Fixed in 2.38.6-1Fixed in 2.42.1-1
  3. Upgrade

    Upgrade Apple macOS to a version that resolves this vulnerability.

    Fixed in 11.5
  4. Upgrade

    Upgrade tvOS to a version that resolves this vulnerability.

    Fixed in 14.7
  5. Upgrade

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

    Fixed in 7.6
  6. Upgrade

    Upgrade Safari to a version that resolves this vulnerability.

    Fixed in 14.1.2
  7. Upgrade

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

    Fixed in 2.32.3
  8. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 11.5
  9. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 14.7
  10. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 7.6
  11. Upgrade

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

    Fixed in 2.32.3-r0
  12. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 1.2.0
  13. Upgrade

    Upgrade iOS to a version that resolves this vulnerability.

    Fixed in 14.7
  14. Upgrade

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

    Fixed in 11.5
  15. Upgrade

    Upgrade watchOS to a version that resolves this vulnerability.

    Fixed in 7.6

Event History

Jul 19, 2021
Data Sourced
via Apple·12:00 AM
DescriptionWeaknessAffected Software
Jul 28, 2021
Data Sourced
via Red Hat·01:47 PM
DescriptionSeverityAffected Software
Sep 8, 2021
CVE Published
via MITRE·01:49 PM
Data Sourced
via MITRE·01:49 PM
DescriptionWeakness
Data Sourced
via NVD·02:15 PM
DescriptionSeverityWeaknessAffected Software
Data Sourced
via OSV·02:15 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 the vulnerability ID of this issue?

The vulnerability ID of this issue is CVE-2021-30795.

2

What is the description of this vulnerability?

This vulnerability is a use after free issue in WebKit, which has been addressed with improved memory management.

3

Which software products are affected by this vulnerability?

The affected software products include Apple Safari up to version 14.1.2, macOS Big Sur up to version 11.5, watchOS up to version 7.6, and tvOS up to version 14.7.

4

How can I fix this vulnerability?

To fix this vulnerability, make sure you update your software to the recommended versions: Apple Safari 14.1.2, macOS Big Sur 11.5, watchOS 7.6, and tvOS 14.7.

5

Is there any additional information about this vulnerability?

Yes, you can find more information about this vulnerability and the recommended updates in the references provided by Apple.

Company

Resources

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