Security restrictions bypass in Samba Rsync

1) Security restrictions bypass

EUVDB-ID: #VU10307

Risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-5764

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security controls on the target system.

The weakness exists in the parse_arguments() function in 'options.c' due to insufficient validation of user-supplied input. A remote attacker can send multiple '--protect-args' values and  bypass the argument-sanitization protection mechanism.

Mitigation

Update to version 3.1.3.

Vulnerable software versions

Rsync: 3.1.0 - 3.1.2

External links

http://download.samba.org/pub/rsync/src-previews/rsync-3.1.3pre1-NEWS

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.