VDB-11333 · CVE-2013-6791 · BID 64022

Microsoft Enhanced Mitigation Experience Toolkit EMET 3.5 Tech Preview/4.0 Beta ASLR information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.00

A vulnerability, which was classified as problematic, has been found in Microsoft Enhanced Mitigation Experience Toolkit EMET 3.5 Tech Preview/4.0 Beta. This issue affects an unknown function of the component ASLR. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is integrity. The summary by CVE is:

Microsoft Enhanced Mitigation Experience Toolkit (EMET) before 4.0 uses predictable addresses for hooked functions, which makes it easier for context-dependent attackers to defeat the ASLR protection mechanism via a return-oriented programming (ROP) attack.

The weakness was presented 06/17/2013 by Yu Yang with NSFocus as Microsoft EMET ASLR Mechanism Tampering Vulnerability as confirmed advisory (Website). The advisory is shared at en.nsfocus.com. The public release was coordinated in cooperation with Microsoft. The identification of this vulnerability is CVE-2013-6791 since 11/13/2013. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue. The advisory points out:

Since EMET 3.5 Tech Preview, EMET enhances the protection for ROP via the Hook functions and other methods. But it stores the jump code for Inline Hook in the memory block with fixed address 0x6fff0000. This memory block keeps a number of physical addresses of hooked functions, and the offset is fixed. In other words, EMET provides more easily usable addresses for ROP while hooking system API to defeat ROP. These addresses are always fixed and even independent of impact of ASLR. Attackers can take advantage of these fixed addresses to directly launch ROP attacks without considering ASLR.

After 3 days, there has been an exploit disclosed. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 71176 (Microsoft EMET 3.x >= 3.5 / 4.x < 4.0.4913.26122 ASLR Security Bypass), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows.

Upgrading to version 4.0 eliminates this vulnerability. The upgrade is hosted for download at microsoft.com.

The vulnerability is also documented in the vulnerability database at Tenable (71176). See VDB-79485, VDB-80218, VDB-80857 and VDB-137815 for similar entries.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 71176
Nessus Name: Microsoft EMET 3.x >= 3.5 / 4.x < 4.0.4913.26122 ASLR Security Bypass
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Upgrade: Enhanced Mitigation Experience Toolkit EMET 4.0

Timelineinfo

06/17/2013 🔍
06/17/2013 +0 days 🔍
06/20/2013 +3 days 🔍
11/13/2013 +146 days 🔍
11/29/2013 +16 days 🔍
11/29/2013 +0 days 🔍
12/03/2013 +4 days 🔍
12/03/2013 +0 days 🔍
12/04/2013 +1 days 🔍
06/02/2021 +2737 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: Microsoft EMET ASLR Mechanism Tampering Vulnerability
Researcher: Yu Yang
Organization: NSFocus
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2013-6791 (🔍)
SecurityTracker: 1029411
Vulnerability Center: 42459 - Microsoft EMET before 4.0 Remote Security Bypass Vulnerability via Hooked Functions, Medium
SecurityFocus: 64022 - Microsoft Enhanced Mitigation Experience Toolkit Hooked Functions Security Bypass Vulnerability
OSVDB: 100398

See also: 🔍

Entryinfo

Created: 12/03/2013 08:46
Updated: 06/02/2021 15:07
Changes: 12/03/2013 08:46 (74), 05/16/2017 04:39 (2), 06/02/2021 15:03 (3), 06/02/2021 15:07 (1)
Complete: 🔍
Cache ID: 3:FB5:103

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