#VU242 Incorrect ACL get/set allowed on symlink path in Samba and Oracle Linux - CVE-2015-7560

Vulnerability identifier: #VU242

Vulnerability risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

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
https://www-01.ibm.com/support/docview.wss?uid=swg21986595
https://www.samba.org/samba/security/CVE-2015-7560.html
https://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.