Improper input validation in samba (Alpine package)

1) Improper input validation

EUVDB-ID: #VU24466

Risk: Medium

CVSSv3.1: 5 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-14907

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect processing of certain user-controlled string, if logging is enabled at level 3 or above. A remote attacker can send specially crafted data to the Samba DC and terminate Samba RPC server.

Mitigation

Install update from vendor's website.

Vulnerable software versions

samba (Alpine package): 4.1.1-r0 - 4.8.12-r1

CPE2.3

• cpe:2.3:o:alpine:samba_alpine_package:4.8.4-r1:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:samba_alpine_package:4.8.0-r0:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:samba_alpine_package:4.8.1-r0:*:*:*:*:alpine_linux:*:

External links

http://git.alpinelinux.org/aports/commit/?id=515e98e6bdc49a7db3aa081e1de4fd5f727bb851
http://git.alpinelinux.org/aports/commit/?id=46ba7ec46d3cb4084489531ce10e71e17963495b
http://git.alpinelinux.org/aports/commit/?id=0ed412d466e679ac0e649cf8c413b67f729bc5a8
http://git.alpinelinux.org/aports/commit/?id=b3a750a9f748a73e74fc78b2e49eb796e5496960
http://git.alpinelinux.org/aports/commit/?id=fddd8a3d858001f0e0d27c7fd9e1ffddf8ccdd2e

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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