Improper Handling of Exceptional Conditions in BusyBox - CVE-2021-28831

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Main Vulnerability Database Vulnerabilities #VU51741

Improper Handling of Exceptional Conditions in BusyBox - CVE-2021-28831

Published: March 26, 2021 / Updated: February 9, 2022


Vulnerability identifier: #VU51741
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-28831
CWE-ID: CWE-755
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper handling of error bit on the huft_build result pointer in decompress_gunzip.c. A remote attacker can pass malformed gzip data to the application, trigger an invalid free and perform a denial of service (DoS) attack.


Affected software

BusyBox
Arch Linux
Gentoo Linux
Amazon Linux AMI
SUSE CaaS Platform
SUSE Manager Proxy
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Enterprise Storage
SUSE OpenStack Cloud
SUSE OpenStack Cloud Crowbar
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP
Ubuntu
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Module for Basesystem
SUSE Linux Enterprise Realtime Extension
SUSE Linux Enterprise Server for SAP Applications
SUSE Linux Enterprise Desktop
openSUSE Leap
openEuler
Fedora
Isolation Segment
VMware Tanzu Application Service for VMs
Juniper Cloud Native Router
SIMATIC S7-1500 TM MFP - BIOS
cflinuxfs3
SmartFabric OS10
busybox (Alpine package)
busybox (Ubuntu package)
busybox-initramfs (Ubuntu package)
busybox-static (Ubuntu package)
busybox
busybox-static
busybox-petitboot
busybox-debuginfo
busybox-help
busybox-debugsource
busybox-warewulf3
busybox-testsuite
VMware Tanzu Operations Manager
IBM QRadar Network Security
Junos cRPD

How to mitigate CVE-2021-28831

Install update from vendor's website.

Isolation Segment - addressed in versions 2.11.40, 2.13.25, 3.0.18, 4.0.10
VMware Tanzu Application Service for VMs - addressed in versions 2.11.46, 2.13.28, 3.0.18, 4.0.10
cflinuxfs3 - update to 0.269.0
busybox (Alpine package) - update to 1.30.1-r5
VMware Tanzu Operations Manager - addressed in versions 2.9.39, 2.10.40, 2.10.61
IBM QRadar Network Security - addressed in versions 5.4.0.16, 5.5.0.11
busybox (Ubuntu package) - addressed in versions Ubuntu Pro, 1:1.22.015ubuntu1.4+esm1, 1:1.27.2-2ubuntu3.4, 1:1.30.1-4ubuntu6.4, 1:1.30.1-6ubuntu2.1, 1:1.30.1-6ubuntu3.1
busybox-initramfs (Ubuntu package) - addressed in versions Ubuntu Pro, 1:1.22.015ubuntu1.4+esm1, 1:1.27.2-2ubuntu3.4, 1:1.30.1-4ubuntu6.4, 1:1.30.1-6ubuntu2.1, 1:1.30.1-6ubuntu3.1
busybox-static (Ubuntu package) - addressed in versions Ubuntu Pro, 1:1.22.015ubuntu1.4+esm1, 1:1.27.2-2ubuntu3.4, 1:1.30.1-4ubuntu6.4, 1:1.30.1-6ubuntu2.1, 1:1.30.1-6ubuntu3.1
busybox - addressed in versions 1.26.2-4.5.1, 1.34.1-4.9.1, 1.35.0-4.3.1, 1.35.0-150400.3.3.1
busybox-static - addressed in versions 1.26.2-4.5.1, 1.34.1-4.9.1, 1.35.0-150400.3.3.1
busybox-petitboot - update to 1.31.1-7
busybox - update to 1.31.1-7
busybox-debuginfo - update to 1.31.1-7
busybox-help - update to 1.31.1-7
busybox-debugsource - update to 1.31.1-7
busybox - addressed in versions 1.32.1-1.fc32, 1.32.1-1.fc33, 1.33.0-3.fc34
busybox-warewulf3 - update to 1.35.0-150400.3.3.1
busybox-testsuite - update to 1.35.0-150400.3.3.1
SmartFabric OS10 - addressed in versions 10.5.4.15, 10.5.5.14, 10.5.6.9
Juniper Cloud Native Router - update to 23.4R1
Junos cRPD - update to 23.4R1

External References

Related Security Bulletins