Security restrictions bypass in samba (Alpine package)



Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2016-2119
CWE-ID CWE-264
Exploitation vector Network
Public exploit N/A
Vulnerable software
 samba (Alpine package)
Operating systems & Components / Operating system package or component

Vendor Alpine Linux Development Team

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Security restrictions bypass

EUVDB-ID: #VU101

Risk: High

CVSSv4.0: 6.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2016-2119

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote attacker to downgrade client signing security controls on the target system.

The vulnerability exists due to state error in Samba. A remote unauthenticated attacker can downgrade the required signing for an SMB2/3 client connection by injecting the SMB2_SESSION_FLAG_IS_GUEST or SMB2_SESSION_FLAG_IS_NULL flags.

Successful exploitation of this vulnerability may result in disclosure of system information.

Mitigation

Install update from vendor's website.

Vulnerable software versions

samba (Alpine package): 4.2.11-r0

CPE2.3 External links

https://git.alpinelinux.org/aports/commit/?id=1e156e7db5e2080b5c8a520723658b03135a744d
https://git.alpinelinux.org/aports/commit/?id=8c3dbd899b5d63ad9b297061811c24b56c1f2f3f
https://git.alpinelinux.org/aports/commit/?id=39446f19b63e3c12f6e9cb331ecdb198db3600cf


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.



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