Linux Kernel up to 4.19.8 USB Subsystem drivers/usb/core/usb.c __usb_get_extra_descriptor resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 4.19.8. This issue affects the function __usb_get_extra_descriptor of the file drivers/usb/core/usb.c of the component USB Subsystem. This manipulation causes resource consumption. This vulnerability is handled as CVE-2018-20169. It is feasible to perform the attack on the physical device. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 4.19.8 (Operating System) and classified as critical. Affected by this vulnerability is the function __usb_get_extra_descriptor of the file drivers/usb/core/usb.c of the component USB Subsystem. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in the Linux kernel before 4.19.9. The USB subsystem mishandles size checks during the reading of an extra descriptor, related to __usb_get_extra_descriptor in drivers/usb/core/usb.c.

The bug was discovered 12/05/2018. The weakness was released 12/17/2018 (Website). It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2018-20169 since 12/17/2018. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 12 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 121289 (openSUSE Security Update : the Linux Kernel (openSUSE-2019-65)), 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 351482 (Amazon Linux Security Advisory for kernel: ALAS2-2019-1145).

Upgrading to version 4.19.9 eliminates this vulnerability. A possible mitigation has been published 4 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (121289) and SecurityFocus (BID 106253†). Entries connected to this vulnerability are available at VDB-113072, VDB-123804, VDB-127475 and VDB-127910. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.6

VulDB Base Score: 6.8
VulDB Temp Score: 6.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.8
NVD Vector: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Yes
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 121289
Nessus Name: openSUSE Security Update : the Linux Kernel (openSUSE-2019-65)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Kernel 4.19.9
Patch: git.kernel.org

Timelineinfo

12/05/2018 🔍
12/17/2018 +12 days 🔍
12/17/2018 +0 days 🔍
12/17/2018 +0 days 🔍
12/17/2018 +0 days 🔍
12/19/2018 +2 days 🔍
01/22/2019 +34 days 🔍
03/23/2019 +60 days 🔍
06/19/2023 +1549 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2019:3309
Status: Confirmed

CVE: CVE-2018-20169 (🔍)
GCVE (CVE): GCVE-0-2018-20169
GCVE (VulDB): GCVE-100-128011
SecurityFocus: 106253 - Linux Kernel CVE-2018-16884 Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 12/17/2018 16:54
Updated: 06/19/2023 12:54
Changes: 12/17/2018 16:54 (79), 04/21/2020 10:18 (4), 06/19/2023 12:54 (5)
Complete: 🔍
Cache ID: 216::103

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