Denial of service in BusyBox



Published: 2021-03-26 | Updated: 2022-02-09
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-28831
CWE-ID CWE-755
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		BusyBox
Universal components / Libraries / Software for developers

Vendor busybox.net

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper Handling of Exceptional Conditions

EUVDB-ID: #VU51741

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-28831

CWE-ID: CWE-755 - Improper Handling of Exceptional Conditions

Exploit availability: No

Description

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

BusyBox: 0.38 - 1.33.0

External links

http://git.busybox.net/busybox/commit/?id=f25d254dfd4243698c31a4f3153d4ac72aa9e9bd


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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