#VU7663 Infinite loop in Samba - CVE-2017-9461

Vulnerability identifier: #VU7663

Vulnerability risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-9461

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Samba
Server applications / Directory software, identity management

Vendor: Samba

Description
The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.

The weakness exists due to improper handling of symbolic links. A remote attacker with access to trusted or internal networks can transmit specially crafted data, trigger and infinite loop and cause the application to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
Update to version 4.5.6.

Vulnerable software versions

Samba: 4.4.0 - 4.4.9, 4.5.0 - 4.5.5

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External links
https://git.samba.org/?p=samba.git;a=commit;h=10c3e3923022485c720f322ca4f0aca5d7501310

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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.