Linux Kernel up to 4.8.13 L2TPv3 IP Encapsulation net/l2tp/l2tp_ip.c use after free

CVSS Meta Temp Score
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CTI Interest Score
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5.9$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Linux Kernel up to 4.8.13. The affected element is an unknown function of the file net/l2tp/l2tp_ip.c of the component L2TPv3 IP Encapsulation. The manipulation results in use after free. This vulnerability is known as CVE-2016-10200. Attacking locally is a requirement. No exploit is available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.8.13 (Operating System). It has been classified as problematic. Affected is an unknown code block of the file net/l2tp/l2tp_ip.c of the component L2TPv3 IP Encapsulation. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Race condition in the L2TPv3 IP Encapsulation feature in the Linux kernel before 4.8.14 allows local users to gain privileges or cause a denial of service (use-after-free) by making multiple bind system calls without properly ascertaining whether a socket has the SOCK_ZAPPED status, related to net/l2tp/l2tp_ip.c and net/l2tp/l2tp_ip6.c.

The bug was discovered 03/01/2017. The weakness was published 03/07/2017 as confirmed git commit (GIT Repository). The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2016-10200 since 02/04/2017. The attack needs to be approached locally. The requirement for exploitation is a 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 6 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 99156 (openSUSE Security Update : the Linux Kernel (openSUSE-2017-418)), 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 169979 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2017:1301-1)).

Upgrading to version 4.8.14 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 (99156), SecurityFocus (BID 101783†) and SecurityTracker (ID 1037965†). Similar entry is available at VDB-93841. 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: 6.1
VulDB Meta Temp Score: 6.0

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.0
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: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 99156
Nessus Name: openSUSE Security Update : the Linux Kernel (openSUSE-2017-418)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 850584
OpenVAS Name: SuSE Update for Kernel openSUSE-SU-2017:0907-1 (Kernel)
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 4.8.14
Patch: git.kernel.org

Timelineinfo

11/18/2016 🔍
02/04/2017 +78 days 🔍
03/01/2017 +25 days 🔍
03/07/2017 +6 days 🔍
03/07/2017 +0 days 🔍
03/07/2017 +0 days 🔍
03/08/2017 +1 days 🔍
04/01/2017 +24 days 🔍
04/03/2017 +2 days 🔍
09/04/2020 +1250 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-10200 (🔍)
GCVE (CVE): GCVE-0-2016-10200
GCVE (VulDB): GCVE-100-97620
SecurityFocus: 101783 - Linux Kernel CVE-2016-10200 Multiple Privilege Escalation Vulnerabilities
OSVDB: - CVE-2016-10200 - Linux - Use-After-Free Issue
SecurityTracker: 1037965

See also: 🔍

Entryinfo

Created: 03/08/2017 08:17
Updated: 09/04/2020 16:43
Changes: 03/08/2017 08:17 (86), 09/04/2020 16:43 (6)
Complete: 🔍
Cache ID: 216:60C:103

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