Security restrictions bypass in OpenSSH

1) Resource management error

EUVDB-ID: #VU28275

Risk: Low

CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to write arbitrary files to the victim's system.

The vulnerability exists due to improper management of scp(1) when receiving files. A remote attacker who controls the filesystem, can craft a file system that will transfer different file names and contents to the actual user;s filesystem layout, when copied with scp(1) in a configuration that caused utimes(2) to fail (e.g. under a SELinux policy or syscall sandbox).

Exploitation of this vulnerability may allow a malicious attacker to overwrite files on the client's system, however requires additional conditions to be met, such as utimes(2) failure.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

OpenSSH: 5.0p1 - 8.2p1

External links

http://www.openssh.com/txt/release-8.3

Q & A

Can this vulnerability be exploited remotely?

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