Lenovo System Update < 5.06.0034 Multiple Vulnerabilities

This script is Copyright (C) 2015-2016 Tenable Network Security, Inc.


Synopsis :

The remote Windows host contains an application that is affected by
multiple vulnerabilities.

Description :

The version of Lenovo System Update installed on the remote host is
prior to 5.06.0034. It is, therefore, affected by the following
vulnerabilities :

- A flaw exists in SUService.exe (System Update service)
due to generating security tokens for a named pipe in a
predictable manner. A local attacker, by sending a valid
token, can exploit this flaw to execute commands to gain
elevated privileges. (CVE-2015-2219)

- A flaw exists due to a failure to properly validate the
certificate authority chain when downloading updates. A
man-in-the-middle attacker, using a crafted certificate,
can exploit this flaw to inject malicious updates,
thereby allowing the execution of arbitrary files.
(CVE-2015-2233)

- A flaw exists due to signature validation for updates
occurring in a directory having world-writeable
permissions. This can allow a local attacker to swap the
update before it is installed and thereby gain elevated
privileges. (CVE-2015-2234)

Note that Nessus has not tested for these issues but has instead
relied only on the application's self-reported version number.

See also :

https://support.lenovo.com/us/en/product_security/lsu_privilege

Solution :

Upgrade to Lenovo System Update 5.06.0034 or later.

Risk factor :

High / CVSS Base Score : 8.3
(CVSS2#AV:A/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 6.5
(CVSS2#E:POC/RL:OF/RC:C)
Public Exploit Available : true

Family: Windows

Nessus Plugin ID: 83736 ()

Bugtraq ID: 74634
74642
74649

CVE ID: CVE-2015-2219
CVE-2015-2233
CVE-2015-2234

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