VDB-99533 · CVE-2017-0199 · EDB 41934

Microsoft Office 2007/2010/2013/2016 RTF Document Necurs Dridex access control

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.9	$0-$5k	0.00

A vulnerability, which was classified as very critical, has been found in Microsoft Office 2007/2010/2013/2016 (Office Suite Software). This issue affects an unknown function of the component RTF Document Handler. The manipulation with an unknown input leads to a access control vulnerability (Necurs Dridex). Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability.

The bug was discovered 04/11/2017. The weakness was presented 04/07/2017 by Haifei Li (SecuriTeam) with McAfee as Critical Office Zero-Day Attacks Detected in the Wild as confirmed article (Website). The advisory is shared at securingtomorrow.mcafee.com. The public release happened without involvement of Microsoft. The identification of this vulnerability is CVE-2017-0199 since 09/09/2016. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are unknown but a public exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/28/2022). MITRE ATT&CK project uses the attack technique T1068 for this issue. Due to its background and reception, this vulnerability has a historic impact. The advisory points out:

Yesterday, we observed suspicious activities from some samples. After quick but in-depth research, this morning we have confirmed these samples are exploiting a vulnerability in Microsoft Windows and Office that is not yet patched.

A public exploit has been developed in Python and been published 3 weeks after the advisory. The exploit is available at exploit-db.com. It is declared as highly functional. The vulnerability was handled as a non-public zero-day exploit for at least 188 days. During that time the estimated underground price was around $25k-$100k. A worm is spreading, which is automatically exploiting this vulnerability. The vulnerability scanner Nessus provides a plugin with the ID 99285 (Windows Server 2012 April 2017 Security Updates (Petya)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 110297 (Microsoft Office and Microsoft Office Services and Web Apps Security Update April 2017). The code used by the exploit is:

ministream_data << "01000002090000000100000000000000" # 00000000: ................
ministream_data << "0000000000000000a4000000e0c9ea79" # 00000010: ...............y
ministream_data << "f9bace118c8200aa004ba90b8c000000" # 00000020: .........K......
ministream_data << generate_uri
ministream_data << "00000000795881f43b1d7f48af2c825d" # 000000a0: ....yX..;..H.,.]
ministream_data << "c485276300000000a5ab0000ffffffff" # 000000b0: ..'c............
ministream_data << "0609020000000000c000000000000046" # 000000c0: ...............F
ministream_data << "00000000ffffffff0000000000000000" # 000000d0: ................
ministream_data << "906660a637b5d2010000000000000000" # 000000e0: .f`.7...........
ministream_data << "00000000000000000000000000000000" # 000000f0: ................
ministream_data << "100203000d0000000000000000000000" # 00000100: ................
ministream_data << "00000000000000000000000000000000" # 00000110: ................
ministream_data << "00000000000000000000000000000000" # 00000120: ................
ministream_data << "00000000000000000000000000000000" # 00000130: ................
ministream_data << "00000000000000000000000000000000" # 00000140: ................
ministream_data << "00000000000000000000000000000000" # 00000150: ................
ministream_data << "00000000000000000000000000000000" # 00000160: ................
ministream_data << "00000000000000000000000000000000" # 00000170: ................
ministream_data << "00000000000000000000000000000000" # 00000180: ................
ministream_data << "00000000000000000000000000000000" # 00000190: ................
ministream_data << "00000000000000000000000000000000" # 000001a0: ................
ministream_data << "00000000000000000000000000000000" # 000001b0: ................
ministream_data << "00000000000000000000000000000000" # 000001c0: ................
ministream_data << "00000000000000000000000000000000" # 000001d0: ................
ministream_data << "00000000000000000000000000000000" # 000001e0: ................
ministream_data << "00000000000000000000000000000000" # 000001f0: ................

The advisory illustrates:

The samples we have detected are organized as Word files (more specially, RTF files with “.doc” extension name). (...) The exploit connects to a remote server (controlled by the attacker), downloads a file that contains HTML application content, and executes it as an .hta file. Because .hta is executable, the attacker gains full code execution on the victim’s machine. Thus, this is a logical bug, and gives the attackers the power to bypass any memory-based mitigations developed by Microsoft.

It appears that this issue was not exploited during the Petya/NotPetya attack campaign.The CISA Known Exploited Vulnerabilities Catalog lists this issue since 11/03/2021 with a due date of 05/03/2022:

Apply updates per vendor instructions.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at portal.msrc.microsoft.com. A possible mitigation has been published 4 days after the disclosure of the vulnerability. The article contains the following remark:

Do not open any Office files obtained from untrusted locations. According to our tests, this active attack cannot bypass the Office Protected View, so we suggest everyone ensure that Office Protected View is enabled.

The vulnerability is also documented in the databases at Tenable (99285) and Exploit-DB (41934). arstechnica.com is providing further details. See 99653, 99654, 99655 and 99656 for similar entries.

Affected

Microsoft Office 2007/2010/2013/2016
Microsoft Wordpad

Productinfo

Type

Office Suite Software

Vendor

Microsoft

Name

Office

Version

License

commercial

CPE 2.3info

CPE 2.2info

Screenshot

Video

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CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.9

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

VulDB Base Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Name: Necurs Dridex
Class: Access control / Necurs Dridex
CWE: CWE-284 / CWE-266
ATT&CK: T1068

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Highly functional
Wormified: 🔍
Reliability: 🔍
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 99285
Nessus Name: Windows Server 2012 April 2017 Security Updates (Petya)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 800218
OpenVAS Name: Microsoft Windows Monthly Rollup (KB4015551)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Saint ID: microsoft_word_wordpad_rtf
Saint Name: Microsoft Word and WordPad RTF HTA handler command execution

Qualys ID: 🔍
Qualys Name: 🔍

MetaSploit ID: office_word_hta.rb
MetaSploit Name: Microsoft Office Word Malicious Hta Execution
MetaSploit File: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Exploit Delay Time: 🔍

Patch: portal.msrc.microsoft.com
Suricata ID: 2024224
Suricata Class: 🔍
Suricata Message: 🔍

Timelineinfo

09/09/2016 🔍
10/01/2016 +22 days 🔍
04/07/2017 +188 days 🔍
04/07/2017 +0 days 🔍
04/11/2017 +4 days 🔍
04/11/2017 +0 days 🔍
04/11/2017 +0 days 🔍
04/11/2017 +0 days 🔍
04/11/2017 +0 days 🔍
04/12/2017 +1 days 🔍
04/25/2017 +13 days 🔍
04/25/2017 +0 days 🔍
11/28/2022 +2043 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: Critical Office Zero-Day Attacks Detected in the Wild
Researcher: Haifei Li (SecuriTeam)
Organization: McAfee
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-0199 (🔍)
OVAL: 🔍

SecurityTracker: 1038224
SecurityFocus: 97498 - Microsoft Office OLE Feature Remote Code Execution Vulnerability

scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍
See also: 🔍

Entryinfo

Created: 04/11/2017 09:31
Updated: 11/28/2022 08:52
Changes: 04/11/2017 09:31 (124), 10/21/2019 18:16 (2), 11/28/2022 08:52 (4)
Complete: 🔍

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