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

Summaryinfo

A vulnerability was found in Microsoft Enhanced Mitigation Experience Toolkit EMET 3.5 Tech Preview/4.0 Beta. It has been rated as problematic. This vulnerability affects unknown code of the component ASLR. The manipulation leads to information disclosure. This vulnerability is listed as CVE-2013-6791. In addition, an exploit is available. Upgrading the affected component is advised.

Detailsinfo

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. The commercial vulnerability scanner Qualys is able to test this issue with plugin 121615 (Microsoft EMET ASLR Mechanism Bypass Vulnerability).

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

The vulnerability is also documented in the databases at Tenable (71176), SecurityFocus (BID 64022†), OSVDB (100398†) and Vulnerability Center (SBV-42459†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
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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

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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Exploitinginfo

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

Physical: No
Local: No
Remote: Yes

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

EPSS Score: 🔍
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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: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

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 🔍
12/23/2024 +4037 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 (🔍)
GCVE (CVE): GCVE-0-2013-6791
GCVE (VulDB): GCVE-100-11333
SecurityFocus: 64022 - Microsoft Enhanced Mitigation Experience Toolkit Hooked Functions Security Bypass Vulnerability
OSVDB: 100398
SecurityTracker: 1029411
Vulnerability Center: 42459 - Microsoft EMET before 4.0 Remote Security Bypass Vulnerability via Hooked Functions, Medium

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 12/03/2013 08:46
Updated: 12/23/2024 04:02
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), 12/23/2024 04:02 (17)
Complete: 🔍
Committer:
Cache ID: 216::103

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