Input validation error in samba (Alpine package)

1) Input validation error

EUVDB-ID: #VU32348

Risk: Medium

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-5296

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

Samba 3.x and 4.x before 4.1.22, 4.2.x before 4.2.7, and 4.3.x before 4.3.3 supports connections that are encrypted but unsigned, which allows man-in-the-middle attackers to conduct encrypted-to-unencrypted downgrade attacks by modifying the client-server data stream, related to clidfs.c, libsmb_server.c, and smbXcli_base.c.

Mitigation

Install update from vendor's website.

Vulnerable software versions

samba (Alpine package): 4.1.1-r0 - 4.2.3-r3

CPE2.3

• cpe:2.3:o:alpine:samba_alpine_package:4.1.1-r0:*:*:*:*:alpine_linux:*:2.6
• cpe:2.3:o:alpine:samba_alpine_package:4.1.3-r0:*:*:*:*:alpine_linux:*:2.6
• cpe:2.3:o:alpine:samba_alpine_package:4.1.3-r1:*:*:*:*:alpine_linux:*:2.6

External links

https://git.alpinelinux.org/aports/commit/?id=2c8df8d5eb5c12b722deb30952b55b164fc7111a
https://git.alpinelinux.org/aports/commit/?id=47affed1795cc5ca4cdd4625ea53ba85513f0636

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.