Ubuntu update for libzstd



Published: 2022-11-09
Risk High
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2021-24031
CVE-2021-24032
CWE-ID CWE-276
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Ubuntu
Operating systems & Components / Operating system

libzstd1 (Ubuntu package)
Operating systems & Components / Operating system package or component

zstd (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Incorrect default permissions

EUVDB-ID: #VU51639

Risk: High

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-24031

CWE-ID: CWE-276 - Incorrect Default Permissions

Exploit availability: No

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to incorrect default permissions for files and folders that are set by the application within the command-line utility. A remote attacker can view contents of files and directories or modify them.

Mitigation

Update the affected package libzstd to the latest version.

Vulnerable software versions

Ubuntu: 16.04

libzstd1 (Ubuntu package): before Ubuntu Pro (Infra-only)

zstd (Ubuntu package): before Ubuntu Pro (Infra-only)

External links

http://ubuntu.com/security/notices/USN-5720-1


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) Incorrect default permissions

EUVDB-ID: #VU51640

Risk: High

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-24032

CWE-ID: CWE-276 - Incorrect Default Permissions

Exploit availability: No

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to incorrect default permissions for files and folders that are set by the application within the command-line utility. A remote attacker can view contents of files and directories or modify them.

Mitigation

Update the affected package libzstd to the latest version.

Vulnerable software versions

Ubuntu: 16.04

libzstd1 (Ubuntu package): before Ubuntu Pro (Infra-only)

zstd (Ubuntu package): before Ubuntu Pro (Infra-only)

External links

http://ubuntu.com/security/notices/USN-5720-1


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.



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