Amazon Linux AMI update for samba

Published: 2017-12-22

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2017-14746 CVE-2017-15275
CWE-ID	CWE-416 CWE-401
Exploitation vector	Local network
Public exploit	N/A
Vulnerable software	Amazon Linux AMI Operating systems & Components / Operating system
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU9372

Risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-14746

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a use-after-free error when processing SMB1 requests. A remote attacker can send a specially crafted SMB1 request to vulnerable server, trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable SMB server.

Mitigation

Update the affected packages.

i686:
    ctdb-tests-4.6.2-12.37.amzn1.i686
    samba-devel-4.6.2-12.37.amzn1.i686
    samba-test-libs-4.6.2-12.37.amzn1.i686
    samba-4.6.2-12.37.amzn1.i686
    samba-client-4.6.2-12.37.amzn1.i686
    samba-winbind-modules-4.6.2-12.37.amzn1.i686
    samba-debuginfo-4.6.2-12.37.amzn1.i686
    samba-client-libs-4.6.2-12.37.amzn1.i686
    ctdb-4.6.2-12.37.amzn1.i686
    samba-common-tools-4.6.2-12.37.amzn1.i686
    samba-libs-4.6.2-12.37.amzn1.i686
    samba-winbind-4.6.2-12.37.amzn1.i686
    samba-common-libs-4.6.2-12.37.amzn1.i686
    libsmbclient-devel-4.6.2-12.37.amzn1.i686
    samba-krb5-printing-4.6.2-12.37.amzn1.i686
    samba-python-4.6.2-12.37.amzn1.i686
    libsmbclient-4.6.2-12.37.amzn1.i686
    samba-test-4.6.2-12.37.amzn1.i686
    samba-winbind-krb5-locator-4.6.2-12.37.amzn1.i686
    libwbclient-devel-4.6.2-12.37.amzn1.i686
    samba-winbind-clients-4.6.2-12.37.amzn1.i686
    libwbclient-4.6.2-12.37.amzn1.i686

noarch:
    samba-common-4.6.2-12.37.amzn1.noarch
    samba-pidl-4.6.2-12.37.amzn1.noarch

src:
    samba-4.6.2-12.37.amzn1.src

x86_64:
    libwbclient-4.6.2-12.37.amzn1.x86_64
    samba-winbind-modules-4.6.2-12.37.amzn1.x86_64
    samba-krb5-printing-4.6.2-12.37.amzn1.x86_64
    samba-devel-4.6.2-12.37.amzn1.x86_64
    ctdb-4.6.2-12.37.amzn1.x86_64
    samba-test-libs-4.6.2-12.37.amzn1.x86_64
    samba-client-4.6.2-12.37.amzn1.x86_64
    samba-debuginfo-4.6.2-12.37.amzn1.x86_64
    samba-libs-4.6.2-12.37.amzn1.x86_64
    samba-common-tools-4.6.2-12.37.amzn1.x86_64
    samba-winbind-4.6.2-12.37.amzn1.x86_64
    samba-python-4.6.2-12.37.amzn1.x86_64
    samba-winbind-krb5-locator-4.6.2-12.37.amzn1.x86_64
    samba-common-libs-4.6.2-12.37.amzn1.x86_64
    ctdb-tests-4.6.2-12.37.amzn1.x86_64
    libsmbclient-4.6.2-12.37.amzn1.x86_64
    libwbclient-devel-4.6.2-12.37.amzn1.x86_64
    libsmbclient-devel-4.6.2-12.37.amzn1.x86_64
    samba-client-libs-4.6.2-12.37.amzn1.x86_64
    samba-test-4.6.2-12.37.amzn1.x86_64
    samba-4.6.2-12.37.amzn1.x86_64
    samba-winbind-clients-4.6.2-12.37.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*

External links

https://alas.aws.amazon.com/ALAS-2017-933.html

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

2) Memory leak

EUVDB-ID: #VU9373