ID CVE-2014-3677
Summary Unspecified vulnerability in Shim might allow attackers to execute arbitrary code via a crafted MOK list, which triggers memory corruption.
References
Vulnerable Configurations
  • cpe:2.3:a:shim:shim
    cpe:2.3:a:shim:shim
CVSS
Base: 7.5 (as of 23-10-2014 - 09:11)
Impact:
Exploitability:
CWE CWE-94
CAPEC
  • Leverage Executable Code in Non-Executable Files
    An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
  • Manipulating User-Controlled Variables
    This attack targets user controlled variables (DEBUG=1, PHP Globals, and So Forth). An attacker can override environment variables leveraging user-supplied, untrusted query variables directly used on the application server without any data sanitization. In extreme cases, the attacker can change variables controlling the business logic of the application. For instance, in languages like PHP, a number of poorly set default configurations may allow the user to override variables.
Access
VectorComplexityAuthentication
NETWORK LOW NONE
Impact
ConfidentialityIntegrityAvailability
PARTIAL PARTIAL PARTIAL
redhat via4
advisories
bugzilla
id 1148232
title CVE-2014-3677 shim: memory corruption flaw when processing Machine Owner Keys (MOKs)
oval
AND
  • OR
    • comment Red Hat Enterprise Linux 7 Client is installed
      oval oval:com.redhat.rhsa:tst:20140675001
    • comment Red Hat Enterprise Linux 7 Server is installed
      oval oval:com.redhat.rhsa:tst:20140675002
    • comment Red Hat Enterprise Linux 7 Workstation is installed
      oval oval:com.redhat.rhsa:tst:20140675003
    • comment Red Hat Enterprise Linux 7 ComputeNode is installed
      oval oval:com.redhat.rhsa:tst:20140675004
  • OR
    • AND
      • comment mokutil is earlier than 0:0.7-8.el7_0
        oval oval:com.redhat.rhsa:tst:20141801007
      • comment mokutil is signed with Red Hat redhatrelease2 key
        oval oval:com.redhat.rhsa:tst:20141801008
    • AND
      • comment shim is earlier than 0:0.7-8.el7_0
        oval oval:com.redhat.rhsa:tst:20141801005
      • comment shim is signed with Red Hat redhatrelease2 key
        oval oval:com.redhat.rhsa:tst:20141801006
    • AND
      • comment shim-unsigned is earlier than 0:0.7-8.el7_0
        oval oval:com.redhat.rhsa:tst:20141801009
      • comment shim-unsigned is signed with Red Hat redhatrelease2 key
        oval oval:com.redhat.rhsa:tst:20141801010
    • AND
      • comment shim is earlier than 0:0.7-8.el7_0
        oval oval:com.redhat.rhsa:tst:20141801005
      • comment shim is signed with Red Hat redhatrelease2 key
        oval oval:com.redhat.rhsa:tst:20141801006
    • AND
      • comment shim-signed is earlier than 0:0.7-8.el7_0
        oval oval:com.redhat.rhsa:tst:20141801011
      • comment shim-signed is signed with Red Hat redhatrelease2 key
        oval oval:com.redhat.rhsa:tst:20141801012
rhsa
id RHSA-2014:1801
released 2014-11-04
severity Moderate
title RHSA-2014:1801: shim security update (Moderate)
rpms
  • mokutil-0:0.7-8.el7_0
  • shim-0:0.7-8.el7_0
  • shim-unsigned-0:0.7-8.el7_0
  • shim-0:0.7-8.el7_0
  • shim-signed-0:0.7-8.el7_0
refmap via4
bid 70410
mlist [oss-security] 20141013 shim RCE
xf shim-cve20143677-code-exec(96989)
Last major update 13-11-2014 - 22:05
Published 22-10-2014 - 10:55
Last modified 28-08-2017 - 21:34
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