Bug 2023888 (CVE-2021-42375)

Summary: CVE-2021-42375 busybox: incorrect handling of a special element in ash applet leads to denial of service when processing a crafted shell command
Product: [Other] Security Response Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: vulnerabilityAssignee: Nobody <nobody>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: admiller, byen, caswilli, dvlasenk, kaycoth, spotrh
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: BusyBox 1.34.0 Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in BusyBox, where it did not properly sanitize while processing a special element in ash, leading to a denial of service. The highest threat from this vulnerability is to system availability.
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Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2023889    
Bug Blocks: 2023944    

Description Guilherme de Almeida Suckevicz 2021-11-16 18:31:00 UTC 
An incorrect handling of a special element in ash leads to denial of service when processing a crafted shell command, due to the shell mistaking specific characters for reserved characters. This may be used for DoS under rare conditions of filtered command input.

Reference:
https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/
Comment 1 Guilherme de Almeida Suckevicz 2021-11-16 18:31:14 UTC 
Created busybox tracking bugs for this issue:

Affects: fedora-all [bug 2023889]