Input validation error in samba (Alpine package)

1) Input validation error

EUVDB-ID: #VU33302

Risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2012-6150

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote #AU# to read and manipulate data.

The winbind_name_list_to_sid_string_list function in nsswitch/pam_winbind.c in Samba through 4.1.2 handles invalid require_membership_of group names by accepting authentication by any user, which allows remote authenticated users to bypass intended access restrictions in opportunistic circumstances by leveraging an administrator's pam_winbind configuration-file mistake.

Mitigation

Install update from vendor's website.

Vulnerable software versions

samba (Alpine package): 3.6.20-r0

CPE2.3

• cpe:2.3:a:alpine:samba_alpine_package:3.6.20-r0:*:*:*:*:alpine_linux:*:2.4

External links

https://git.alpinelinux.org/aports/commit/?id=62722265236fe9b456b06077a278c59167d698d0
https://git.alpinelinux.org/aports/commit/?id=c814185629eb7f0e1166f5ba094e8402cefd1587
https://git.alpinelinux.org/aports/commit/?id=34697bf099f0ece957068bf39dc6c622f5141bd0
https://git.alpinelinux.org/aports/commit/?id=5d3b50a2026251615d9737322617519e8711a5de

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.