Security restrictions bypass in postgresql (Alpine package)

1) Security restrictions bypass

EUVDB-ID: #VU50656

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20229

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote user to gain access to sensitive information.

The vulnerability exists due to application does not properly impose security restrictions. A user having a SELECT privilege on an individual column can craft a special query that returns all columns of the table. Additionally, a stored view that uses column-level privileges will have incomplete column-usage bitmaps. In installations that depend on column-level permissions for security, it is recommended to execute CREATE OR REPLACE on all user-defined views to force them to be re-parsed.

Mitigation

Install update from vendor's website.

Vulnerable software versions

postgresql (Alpine package): 13.1-r2

External links

http://git.alpinelinux.org/aports/commit/?id=87ef3a18fd31dcdb5a100656f41792899105eb76
http://git.alpinelinux.org/aports/commit/?id=de44e327d46ea44425f83cbf8c0d3368ecf74399

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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