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.
4.7	$0-$5k	0.00

Summaryinfo

A vulnerability was found in RarLabs WinRar 4.20. It has been rated as problematic. This vulnerability affects unknown code of the component Filename Handler. The manipulation leads to authentication spoofing. Furthermore, there is an exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in RarLabs WinRar 4.20 (File Compression Software). This issue affects an unknown function of the component Filename Handler. The manipulation with an unknown input leads to a authentication spoofing vulnerability. Using CWE to declare the problem leads to CWE-290. This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. Impacted is integrity.

The weakness was shared 03/23/2014 by Danor Cohen (An7i) as WinRar File extension spoofing (0Day) as not defined exploit (Website). It is possible to read the advisory at an7isec.blogspot.co.il. 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. The advisory points out:

So by the file format descriptor, we can see that the Bits at offset 30 are referred to the file name of the compressed file. When we try to compress the file as "ZIP Format" with WINRAR, the file structure looks the same, but! WINRAR adds several properties of its own. WINRAR add extra "file name" into the compressed file like extra "filename". Further analysis reveals that the second name is the "File Name" of the file, that WINRAR will give to the output uncompressed file, while the First name is the name that appears at the WINRAR GUI window.

A public exploit has been developed by Danor Cohen and been published immediately after the advisory. The exploit is available at an7isec.blogspot.co.il. It is declared as proof-of-concept.

A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (92103), Exploit-DB (32752), SecurityFocus (BID 66383†), OSVDB (62610†) and Secunia (SA57754†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• File Compression Software

Vendor

• RarLabs

Name

• WinRar

Version

• 4.20

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.7

VulDB Base Score: 5.3
VulDB Temp Score: 4.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

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: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Authentication spoofing
CWE: CWE-290 / CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Danor Cohen
Download: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Timelineinfo

09/28/2009 🔍
03/01/2010 +154 days 🔍
03/23/2014 +1482 days 🔍
03/23/2014 +0 days 🔍
03/23/2014 +0 days 🔍
03/31/2014 +8 days 🔍
04/08/2014 +8 days 🔍
08/22/2016 +867 days 🔍

Sourcesinfo

Advisory: WinRar File extension spoofing (0Day)
Researcher: Danor Cohen (An7i)
Status: Not defined

GCVE (VulDB): GCVE-100-12719
X-Force: 92103 - WinRAR filenames spoofing, Medium Risk
SecurityFocus: 66383 - RARLAB WinRAR File Extension Spoofing Vulnerability
Secunia: 57754
OSVDB: 62610 - WinRAR ZIP Filename Spoofing Weakness

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

Entryinfo

Created: 03/31/2014 13:24
Updated: 08/22/2016 10:14
Changes: 03/31/2014 13:24 (62), 08/22/2016 10:14 (2)
Complete: 🔍
Cache ID: 216:F59:103

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