Vulnerability identifier: #VU242

Vulnerability risk: Medium

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

CVE-ID: CVE-2015-7560

CWE-ID: CWE-61

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Samba
Server applications / Directory software, identity management
Oracle Linux
Operating systems & Components / Operating system

Vendor: Samba
Oracle

Description
The vulnerability allows a remote attacker to launch a symlink attack.

The vulnerability exists in Samba. A remote authenticated attacker can overwrite access control lists on the directory by creating a symbolic link to a file or directory using SMB1 UNIX extensions and then issuing a non-UNIX SMB1.

Successful exploitation of this vulnerability may result in a symlink attack.

Mitigation
Install Samba 4.4.0rc4, 4.3.6, 4.2.9 and 4.1.23.

Vulnerable software versions

Samba: 3.2.0, 4.0.0

Oracle Linux: 6 - 7

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External links
http://www-01.ibm.com/support/docview.wss?uid=swg21986595
http://www.samba.org/samba/security/CVE-2015-7560.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html

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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.