VDB-116980 · CVE-2018-8781 · RHSA-2018:2948

Linux Kernel up to 3.4/4.15 udldrmfb Driver udl_fb.c udl_fb_mmap integer overflow

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.
7.6	$0-$5k	0.00

Summaryinfo

A vulnerability labeled as critical has been found in Linux Kernel up to 3.4/4.15. The affected element is the function udl_fb_mmap of the file drivers/gpu/drm/udl/udl_fb.c of the component udldrmfb Driver. Executing a manipulation can lead to integer overflow. This vulnerability is registered as CVE-2018-8781. The attack needs to be launched locally. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 3.4/4.15 (Operating System). It has been declared as critical. This vulnerability affects the function udl_fb_mmap of the file drivers/gpu/drm/udl/udl_fb.c of the component udldrmfb Driver. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The udl_fb_mmap function in drivers/gpu/drm/udl/udl_fb.c at the Linux kernel version 3.4 and up to and including 4.15 has an integer-overflow vulnerability allowing local users with access to the udldrmfb driver to obtain full read and write permissions on kernel physical pages, resulting in a code execution in kernel space.

The bug was discovered 03/21/2018. The weakness was published 04/23/2018 (Website). The advisory is shared for download at lists.debian.org. This vulnerability was named CVE-2018-8781 since 03/19/2018. The attack needs to be approached locally. A single authentication is necessary for exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 33 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 110345 (SUSE SLES12 Security Update : kernel (SUSE-SU-2018:1510-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 256510 (CentOS Security Update for kernel (CESA-2018:3083)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (110345), SecurityFocus (BID 103459†) and CERT Bund (WID-SEC-2022-0532). Similar entries are available at VDB-110288, VDB-110784, VDB-111325 and VDB-113823. Once again VulDB remains the best source for vulnerability data.

Affected

Oracle Linux
Debian Linux
Open Source Linux Kernel
Red Hat Enterprise Linux
Ubuntu Linux
SUSE Linux
Oracle VM
NetApp FAS
Avaya Aura Communication Manager
Avaya Aura Session Manager
Avaya Aura Application Enablement Services
Avaya Aura System Manager
Avaya Aura Experience Portal
NetApp AFF

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

License

open-source

Website

Vendor: https://www.kernel.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.6

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
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Nessus ID: 110345
Nessus Name: SUSE SLES12 Security Update : kernel (SUSE-SU-2018:1510-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 58191
OpenVAS Name: Debian LTS Advisory ([SECURITY] [DLA 1369-1] linux security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Timelineinfo

03/05/2018 🔍
03/19/2018 +14 days 🔍
03/21/2018 +2 days 🔍
04/23/2018 +32 days 🔍
04/23/2018 +0 days 🔍
04/24/2018 +1 days 🔍
06/05/2018 +42 days 🔍
06/06/2018 +1 days 🔍
09/14/2025 +2657 days 🔍