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.
6.7	$0-$5k	0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Dell Pre-Boot Authentication Driver 1.0.1.5. This issue affects some unknown processing in the library PBADRV.sys. The manipulation with the input 0x0022201c as part of IOCTL leads to access control. This vulnerability is uniquely identified as CVE-2015-6856. Moreover, an exploit is present.

Detailsinfo

A vulnerability was found in Dell Pre-Boot Authentication Driver 1.0.1.5 (Hardware Driver Software). It has been rated as problematic. This issue affects some unknown functionality in the library PBADRV.sys. The manipulation with the input value 0x0022201c leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Dell Pre-Boot Authentication Driver (PBADRV.sys) 1.0.1.5 allows local users to write to arbitrary physical memory locations and gain privileges via a 0x0022201c IOCTL call.

The weakness was disclosed 01/08/2016 by Matt Bergin (Website). The advisory is shared at korelogic.com. The identification of this vulnerability is CVE-2015-6856 since 09/10/2015. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The exploit is available at packetstormsecurity.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 79643†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Hardware Driver Software

Vendor

• Dell

Name

• Pre-Boot Authentication Driver

Version

• 1.0.1.5

License

• commercial

Website

• Vendor: https://www.dell.com/

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

VulDB Base Score: 5.9
VulDB Temp Score: 5.6
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: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

09/10/2015 🔍
12/18/2015 +99 days 🔍
01/08/2016 +21 days 🔍
01/08/2016 +0 days 🔍
01/10/2016 +2 days 🔍
06/18/2024 +3082 days 🔍

Sourcesinfo

Vendor: dell.com

Advisory: 134987
Researcher: Matt Bergin
Status: Not defined

CVE: CVE-2015-6856 (🔍)
GCVE (CVE): GCVE-0-2015-6856
GCVE (VulDB): GCVE-100-80117
SecurityFocus: 79643 - Dell Pre-Boot Authentication Driver CVE-2015-6856 Local Privilege Escalation Vulnerability

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

Entryinfo

Created: 01/10/2016 20:10
Updated: 06/18/2024 14:48
Changes: 01/10/2016 20:10 (59), 06/06/2018 10:56 (4), 07/02/2022 14:58 (3), 06/18/2024 14:48 (23)
Complete: 🔍
Cache ID: 216:9AE:103

Discussion

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