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AUSCERT External Security Bulletin Redistribution
ESB-2021.4159
USN-5179-1: BusyBox vulnerabilities
8 December 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: BusyBox
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-42386 CVE-2021-42385 CVE-2021-42384
CVE-2021-42382 CVE-2021-42381 CVE-2021-42380
CVE-2021-42379 CVE-2021-42378 CVE-2021-42374
CVE-2021-28831
Reference: ESB-2021.3584
ESB-2021.1123
Original Bulletin:
https://ubuntu.com/security/notices/USN-5179-1
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USN-5179-1: BusyBox vulnerabilities
07 December 2021
Several security issues were fixed in BusyBox.
Releases
o Ubuntu 21.10
o Ubuntu 21.04
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o busybox - Tiny utilities for small and embedded systems
Details
It was discovered that BusyBox incorrectly handled certain malformed gzip
archives. If a user or automated system were tricked into processing a
specially crafted gzip archive, a remote attacker could use this issue to
cause BusyBox to crash, resulting in a denial of service, or possibly
execute arbitrary code. ( CVE-2021-28831 )
It was discovered that BusyBox incorrectly handled certain malformed LZMA
archives. If a user or automated system were tricked into processing a
specially crafted LZMA archive, a remote attacker could use this issue to
cause BusyBox to crash, resulting in a denial of service, or possibly
leak sensitive information. ( CVE-2021-42374 )
Vera Mens, Uri Katz, Tal Keren, Sharon Brizinov, and Shachar Menashe
discovered that BusyBox incorrectly handled certain awk patterns. If a user
or automated system were tricked into processing a specially crafted awk
pattern, a remote attacker could use this issue to cause BusyBox to crash,
resulting in a denial of service, or possibly execute arbitrary code.
( CVE-2021-42378 , CVE-2021-42379 , CVE-2021-42380 , CVE-2021-42381 ,
CVE-2021-42382 , CVE-2021-42384 , CVE-2021-42385 , CVE-2021-42386 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.10
o busybox - 1:1.30.1-6ubuntu3.1
o busybox-initramfs - 1:1.30.1-6ubuntu3.1
o busybox-static - 1:1.30.1-6ubuntu3.1
Ubuntu 21.04
o busybox - 1:1.30.1-6ubuntu2.1
o busybox-initramfs - 1:1.30.1-6ubuntu2.1
o busybox-static - 1:1.30.1-6ubuntu2.1
Ubuntu 20.04
o busybox - 1:1.30.1-4ubuntu6.4
o busybox-initramfs - 1:1.30.1-4ubuntu6.4
o busybox-static - 1:1.30.1-4ubuntu6.4
Ubuntu 18.04
o busybox - 1:1.27.2-2ubuntu3.4
o busybox-initramfs - 1:1.27.2-2ubuntu3.4
o busybox-static - 1:1.27.2-2ubuntu3.4
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-28831
o CVE-2021-42378
o CVE-2021-42386
o CVE-2021-42385
o CVE-2021-42382
o CVE-2021-42384
o CVE-2021-42379
o CVE-2021-42374
o CVE-2021-42380
o CVE-2021-42381
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