Linux Kernel 3.4.83/3.10.33/3.13.6/3.13.6 TX Path/STA Wakeup sta_info.c race condition

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6.5$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Linux Kernel 3.4.83/3.10.33/3.13.6/3.13.6. Impacted is an unknown function of the file /net/mac80211/mac80211/sta_info.c of the component TX Path/STA Wakeup Handler. Executing a manipulation can lead to race condition. This vulnerability is registered as CVE-2014-2706. No exploit is available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability has been found in Linux Kernel 3.4.83/3.10.33/3.13.6/3.13.6 (Operating System) and classified as critical. This vulnerability affects an unknown part of the file /net/mac80211/mac80211/sta_info.c of the component TX Path/STA Wakeup Handler. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect availability. CVE summarizes:

Race condition in the mac80211 subsystem in the Linux kernel before 3.13.7 allows remote attackers to cause a denial of service (system crash) via network traffic that improperly interacts with the WLAN_STA_PS_STA state (aka power-save mode), related to sta_info.c and tx.c.

The weakness was published 02/20/2014 by Max Sydorenko as mac80211: fix AP powersave TX vs. wakeup race as confirmed git commit (GIT Repository). The advisory is shared for download at git.kernel.org. The public release has been coordinated with the vendor. This vulnerability was named CVE-2014-2706 since 04/01/2014. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The advisory points out:

There is a race between the TX path and the STA wakeup: while a station is sleeping, mac80211 buffers frames until it wakes up, then the frames are transmitted. However, the RX and TX path are concurrent, so the packet indicating wakeup can be processed while a packet is being transmitted. This can lead to a situation where the buffered frames list is emptied on the one side, while a frame is being added on the other side, as the station is still seen as sleeping in the TX path. As a result, the newly added frame will not be send anytime soon. It might be sent much later (and out of order) when the station goes to sleep and wakes up the next time. Additionally, it can lead to the crash below.

The vulnerability scanner Nessus provides a plugin with the ID 76926 (Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2014-3052)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 123686 (Red Hat Update for kernel (RHSA-2014:1101)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. A possible mitigation has been published immediately after the disclosure of the vulnerability. The git commit contains the following remark:

Fix all this by synchronising both paths with a new lock. Both path are not fastpath since they handle PS situations. In a later patch we'll remove the extra skb queue locks to reduce locking overhead.

The vulnerability is also documented in the databases at X-Force (92293), Tenable (76926), SecurityFocus (BID 66591†), Secunia (SA60613†) and Vulnerability Center (SBV-43877†). Similar entries are available at VDB-12727 and VDB-12999. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
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CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 7.5
VulDB Temp Score: 6.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 76926
Nessus Name: Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2014-3052)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: git.kernel.org

Timelineinfo

02/20/2014 🔍
02/20/2014 +0 days 🔍
04/01/2014 +40 days 🔍
04/02/2014 +1 days 🔍
04/02/2014 +0 days 🔍
04/03/2014 +1 days 🔍
04/08/2014 +5 days 🔍
04/14/2014 +6 days 🔍
07/31/2014 +108 days 🔍
06/16/2021 +2512 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: mac80211: fix AP powersave TX vs. wakeup race
Researcher: Max Sydorenko
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2014-2706 (🔍)
GCVE (CVE): GCVE-0-2014-2706
GCVE (VulDB): GCVE-100-12820

OVAL: 🔍

X-Force: 92293 - Linux Kernel TX path and STA wakeup denial of service, High Risk
SecurityFocus: 66591 - Linux Kernel 'mac80211/sta_info.c' NULL Pointer Dereference Denial of Service Vulnerability
Secunia: 60613
SecurityTracker: 1038201
Vulnerability Center: 43877 - Linux Kernel <3.13.7 Remote Denial of Service Vulnerability in mac80211/sta_info.c, High

See also: 🔍

Entryinfo

Created: 04/08/2014 15:15
Updated: 06/16/2021 14:59
Changes: 04/08/2014 15:15 (79), 05/24/2017 10:57 (5), 06/16/2021 14:58 (3), 06/16/2021 14:59 (1)
Complete: 🔍
Cache ID: 216:0C2:103

Once again VulDB remains the best source for vulnerability data.

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