Linux Kernel up to 4.8.0 USB Device legousbtower.c tower_probe null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Linux Kernel up to 4.8.0. The impacted element is the function tower_probe of the file drivers/usb/misc/legousbtower.c of the component USB Device Handler. Such manipulation leads to null pointer dereference. This vulnerability is traded as CVE-2017-15102. The attack can be executed directly on the physical device. There is no exploit available. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 4.8.0 (Operating System). Affected by this issue is the function tower_probe of the file drivers/usb/misc/legousbtower.c of the component USB Device Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is confidentiality, integrity, and availability. CVE summarizes:

The tower_probe function in drivers/usb/misc/legousbtower.c in the Linux kernel before 4.8.1 allows local users (who are physically proximate for inserting a crafted USB device) to gain privileges by leveraging a write-what-where condition that occurs after a race condition and a NULL pointer dereference.

The bug was discovered 10/08/2017. The weakness was shared 11/15/2017 by Patrick as confirmed git commit (GIT Repository). The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2017-15102 since 10/08/2017. The attack needs to be approached locally. The successful exploitation requires a simple authentication. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 38 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 105150 (SUSE SLES12 Security Update : kernel (SUSE-SU-2017:3249-1) (Dirty COW)), 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 170527 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2017:3265-1)).

Upgrading to version 4.8.1 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (105150) and SecurityFocus (BID 101790†). The entry VDB-109425 is related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.2
VulDB Meta Temp Score: 5.1

VulDB Base Score: 4.1
VulDB Temp Score: 3.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.3
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / 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: 105150
Nessus Name: SUSE SLES12 Security Update : kernel (SUSE-SU-2017:3249-1) (Dirty COW)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 864875
OpenVAS Name: Ubuntu Update for linux USN-3583-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Upgrade: Kernel 4.8.1
Patch: git.kernel.org

Timelineinfo

10/08/2017 🔍
10/08/2017 +0 days 🔍
11/13/2017 +36 days 🔍
11/15/2017 +2 days 🔍
11/15/2017 +0 days 🔍
11/16/2017 +1 days 🔍
12/08/2017 +22 days 🔍
12/11/2017 +3 days 🔍
01/10/2023 +1856 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 2fae9e5a7babada041e2e161699ade2447a01989
Researcher: James Patrick Evans (Patrick)
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-15102 (🔍)
GCVE (CVE): GCVE-0-2017-15102
GCVE (VulDB): GCVE-100-109424
SecurityFocus: 101790 - Linux Kernel CVE-2017-15102 Local Privilege Escalation Vulnerability

See also: 🔍

Entryinfo

Created: 11/16/2017 10:29
Updated: 01/10/2023 12:44
Changes: 11/16/2017 10:29 (79), 12/06/2019 16:28 (10), 01/23/2021 18:14 (2), 01/10/2023 12:36 (2), 01/10/2023 12:44 (1)
Complete: 🔍
Cache ID: 216::103

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