Security Updates for Microsoft Sharepoint Server (September 2017)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The Microsoft Sharepoint Server installation on the remote host is affected by multiple vulnerabilities.

Description :

The Microsoft Sharepoint Server installation on the remote
host is missing security updates. It is, therefore, affected
by multiple vulnerabilities :

- A remote code execution vulnerability exists in
Microsoft Office software when it fails to properly
handle objects in memory. An attacker who successfully
exploited the vulnerability could use a specially
crafted file to perform actions in the security context
of the current user. For example, the file could then
take actions on behalf of the logged-on user with the
same permissions as the current user. Exploitation of
this vulnerability requires that a user open a specially
crafted file with an affected version of Microsoft
Office software. In an email attack scenario, an
attacker could exploit the vulnerability by sending the
specially crafted file to the user and convincing the
user to open the file. In a web-based attack scenario,
an attacker could host a website (or leverage a
compromised website that accepts or hosts user-provided
content) that contains a specially crafted file that is
designed to exploit the vulnerability. However, an
attacker would have no way to force the user to visit
the website. Instead, an attacker would have to convince
the user to click a link, typically by way of an
enticement in an email or Instant Messenger message, and
then convince the user to open the specially crafted
file. The security update addresses the vulnerability by
correcting how Microsoft Office handles files in memory.
(CVE-2017-8631)

- A remote code execution vulnerability exists in
Microsoft Office software when the software fails to
properly handle objects in memory. An attacker who
successfully exploited the vulnerability could run
arbitrary code in the context of the current user. If
the current user is logged on with administrative user
rights, an attacker could take control of the affected
system. An attacker could then install programs; view,
change, or delete data; or create new accounts with full
user rights. Users whose accounts are configured to have
fewer user rights on the system could be less impacted
than users who operate with administrative user rights.
Exploitation of the vulnerability requires that a user
open a specially crafted file with an affected version
of Microsoft Office software. In an email attack
scenario, an attacker could exploit the vulnerability by
sending the specially crafted file to the user and
convincing the user to open the file. In a web-based
attack scenario, an attacker could host a website (or
leverage a compromised website that accepts or hosts
user-provided content) that contains a specially crafted
file designed to exploit the vulnerability. An attacker
would have no way to force users to visit the website.
Instead, an attacker would have to convince users to
click a link, typically by way of an enticement in an
email or instant message, and then convince them to open
the specially crafted file. Note that the Preview Pane
is not an attack vector for this vulnerability. The
security update addresses the vulnerability by
correcting how Office handles objects in memory.
(CVE-2017-8742, CVE-2017-8743)

- An elevation of privilege vulnerability exists when
Microsoft SharePoint Server does not properly sanitize a
specially crafted web request to an affected SharePoint
server. An authenticated attacker could exploit the
vulnerability by sending a specially crafted request to
an affected SharePoint server. The attacker who
successfully exploited the vulnerability could then
perform cross-site scripting attacks on affected systems
and run script in the security context of the current
user. These attacks could allow the attacker to read
content that the attacker is not authorized to read, use
the victim's identity to take actions on the SharePoint
site on behalf of the user, such as change permissions
and delete content, and inject malicious content in the
browser of the user. The security update addresses the
vulnerability by helping to ensure that SharePoint
Server properly sanitizes web requests. (CVE-2017-8629)

- A cross-site scripting (XSS) vulnerability exists when
Microsoft SharePoint Server does not properly sanitize a
specially crafted web request to an affected SharePoint
server. An authenticated attacker could exploit the
vulnerability by sending a specially crafted request to
an affected SharePoint server. The attacker who
successfully exploited the vulnerability could then
perform cross-site scripting attacks on affected systems
and run script in the security context of the current
user. The attacks could allow the attacker to read
content that the attacker is not authorized to read, use
the victim's identity to take actions on the SharePoint
site on behalf of the user, such as change permissions
and delete content, and inject malicious content in the
browser of the user. The security update addresses the
vulnerability by helping to ensure that SharePoint
Server properly sanitizes web requests. (CVE-2017-8745)

See also :

http://www.nessus.org/u?604636cb
http://www.nessus.org/u?a44abe21
http://www.nessus.org/u?af7fb55b
http://www.nessus.org/u?d79043bd
http://www.nessus.org/u?5cbef33e
http://www.nessus.org/u?eb6ab180

Solution :

Microsoft has released the following security updates to address this issue:
-KB4011056
-KB4011117
-KB3213560
-KB4011113
-KB4011127
-KB3191831

Risk factor :

High / CVSS Base Score : 9.3
(CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 6.9
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Windows : Microsoft Bulletins

Nessus Plugin ID: 103141 ()

Bugtraq ID: 100725
100741
100746
100751
100753

CVE ID: CVE-2017-8629
CVE-2017-8631
CVE-2017-8742
CVE-2017-8743
CVE-2017-8745

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