Memory leak in samba (Alpine package)

1) Memory leak

EUVDB-ID: #VU8518

Risk: Low

CVSSv3.1: 4.7 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-12163

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to memory information leak over SMB1. A client with write access to a share can cause server memory contents to be written into a file or printer. Some SMB1 write requests were not correctly range checked to ensure the client had sent enough data to fulfill the write, allowing server memory contents to be written into the file (or printer) instead of client supplied data. The client cannot control the area of the server memory that is written to the file (or printer).

Mitigation

Install update from vendor's website.

Vulnerable software versions

samba (Alpine package): 3.4.8-r0 - 4.4.14-r1

External links

http://git.alpinelinux.org/aports/commit/?id=4013d75e416cb0c1c59bbb3f7ac07d1db141473a
http://git.alpinelinux.org/aports/commit/?id=1c38a7f3b9cd01ff44f483b6f375aee36076925c
http://git.alpinelinux.org/aports/commit/?id=d07f3a244e0806b4e3fe99e12c4d9ddc9a07f8b0

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.