Linux Kernel UDP pppol2tp_setsockopt/pppol2tp_getsockopt access control

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel. It has been classified as problematic. Affected by this vulnerability is the function pppol2tp_setsockopt/pppol2tp_getsockopt of the component UDP Handler. This manipulation causes access control. This vulnerability is tracked as CVE-2014-4943. Moreover, an exploit is present. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel (Operating System) (unknown version). Affected by this vulnerability is the function pppol2tp_setsockopt/pppol2tp_getsockopt of the component UDP Handler. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The PPPoL2TP feature in net/l2tp/l2tp_ppp.c in the Linux kernel through 3.15.6 allows local users to gain privileges by leveraging data-structure differences between an l2tp socket and an inet socket.

The weakness was disclosed 07/16/2014 by Sasha Levin as confirmed git commit (GIT Repository). The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2014-4943 since 07/11/2014. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known. MITRE ATT&CK project uses the attack technique T1068 for this issue.

A public exploit has been developed by Emeric Nasi and been published 9 months after the advisory. It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 79113 (RHEL 6 : kernel (RHSA-2014:1025)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Red Hat Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 123687 (Red Hat Update for kernel (RHSA-2014:0925)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. It is possible to mitigate the problem by applying the configuration setting CONFIG_PPPOL2TP = 0. The best possible mitigation is suggested to be patching the affected component.

The vulnerability is also documented in the databases at X-Force (94665), Exploit-DB (36267), Tenable (79113), SecurityFocus (BID 68683†) and OSVDB (109277†). The entry VDB-66981 is pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.4
VulDB Meta Temp Score: 7.6

VulDB Base Score: 8.4
VulDB Temp Score: 7.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Emeric Nasi
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 79113
Nessus Name: RHEL 6 : kernel (RHSA-2014:1025)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 702992
OpenVAS Name: Debian Security Advisory DSA 2992-1 (linux - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Patch: 3cf521f7dc87c031617fd47e4b7aa2593c2f3daf
Config: CONFIG_PPPOL2TP = 0

Timelineinfo

07/11/2014 🔍
07/16/2014 +5 days 🔍
07/18/2014 +2 days 🔍
07/18/2014 +0 days 🔍
07/19/2014 +1 days 🔍
07/19/2014 +0 days 🔍
07/19/2014 +0 days 🔍
07/20/2014 +1 days 🔍
11/11/2014 +114 days 🔍
03/04/2015 +113 days 🔍
03/04/2015 +0 days 🔍
11/20/2024 +3549 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2014:1025
Researcher: Sasha Levin
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-4943 (🔍)
GCVE (CVE): GCVE-0-2014-4943
GCVE (VulDB): GCVE-100-67177

OVAL: 🔍

X-Force: 94665 - Linux Kernel PPP privilege escalation, Medium Risk
SecurityFocus: 68683
Secunia: 60071 - Linux Kernel PPP Over L2TP Implementation Privilege Escalation Vulnerabilities, Less Critical
OSVDB: 109277
SecurityTracker: 1030610 - Linux Kernel Flaw in PPP over L2TP Sockets Lets Local Users Gain Elevated Privileges
Vulnerability Center: 45513 - Linux Kernel <=3.15.6 Local Privilege Escalation Vulnerability in Net PPPoL2TP, Medium

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

Entryinfo

Created: 07/18/2014 10:42
Updated: 11/20/2024 18:39
Changes: 07/18/2014 10:42 (86), 06/02/2017 07:58 (10), 02/09/2022 15:04 (4), 02/09/2022 15:06 (1), 02/09/2022 15:12 (2), 11/20/2024 18:39 (19)
Complete: 🔍
Cache ID: 216:7C3:103

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