Ubuntu update for busybox

Published: 2023-09-04

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-28831 CVE-2022-48174
CWE-ID	CWE-755 CWE-787
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Ubuntu Operating systems & Components / Operating system busybox-static (Ubuntu package) Operating systems & Components / Operating system package or component busybox-initramfs (Ubuntu package) Operating systems & Components / Operating system package or component busybox (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

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

Update the affected package busybox to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 18.04

busybox-static (Ubuntu package): before Ubuntu Pro

busybox-initramfs (Ubuntu package): before Ubuntu Pro

busybox (Ubuntu package): before Ubuntu Pro

External links

http://ubuntu.com/security/notices/USN-6335-1

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.

2) Out-of-bounds write

EUVDB-ID: #VU80391