Security restrictions bypass in OpenSSH



Published: 2021-04-19
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE ID N/A
CWE ID CWE-264
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe
OpenSSH
Server applications / Remote management servers, RDP, SSH

Vendor OpenSSH

Security Advisory

This security advisory describes one low risk vulnerability.

1) Security restrictions bypass

Risk: Low

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

CVE-ID: N/A

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

Exploit availability: No

Description

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

The vulnerability exists due to application does not properly impose security restrictions, when LogVerbose keyword option is enabled with a set of options that activated logging for the low-privileged sandboxed sshd process. A remote user who can exploit the low-privileged process can escape the OpenSSH sendboxing and attack the high-level processes.

Successful exploitation of this vulnerability requires presence of security issue in the low-level process.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

OpenSSH: 8.5p1

CPE External links

https://www.openssh.com/txt/release-8.6

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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



###SIDEBAR###