CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.6	$0-$5k	0.00

A vulnerability has been found in Linux Kernel 4.0.5 (Operating System) and classified as problematic. This vulnerability affects an unknown part of the file net/ipv4/udp.c of the component UDP Packet Handler. The manipulation with an unknown input leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect availability. CVE summarizes:

The (1) udp_recvmsg and (2) udpv6_recvmsg functions in the Linux kernel before 4.0.6 do not properly consider yielding a processor, which allows remote attackers to cause a denial of service (system hang) via incorrect checksums within a UDP packet flood.

The weakness was shared 07/01/2015 by Salvatore Bonaccorso as confirmed mailinglist post (oss-sec). The advisory is shared for download at seclists.org. This vulnerability was named CVE-2015-5364 since 07/01/2015. 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. Responsible for the vulnerability is the following code:

if (noblock)
   return -EAGAIN;

The advisory points out:

We return -EAGAIN to application even if receive queue is not empty. This breaks applications using edge trigger epoll()

The vulnerability scanner Nessus provides a plugin with the ID 84984 (Ubuntu 14.04 LTS : linux-lts-vivid vulnerabilities (USN-2683-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 350137 (Amazon Linux Security Advisory for kernel: ALAS-2015-565).

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 4 weeks after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

cond_resched();

The mailinglist post contains the following remark:

This patch is an attempt to make things better. We might in the future add extra support for rt applications wanting to better control time spent doing a recv() in a hostile environment. For example we could validate checksums before queuing packets in socket receive queue.

The vulnerability is also documented in the databases at X-Force (104416) and Tenable (84984). The entries 75684, 76325, 81579 and 83100 are related to this item.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 4.0.5

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.6

VulDB Base Score: 5.3
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 84984
Nessus Name: Ubuntu 14.04 LTS : linux-lts-vivid vulnerabilities (USN-2683-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703313
OpenVAS Name: Debian Security Advisory DSA 3313-1 (linux - security update)
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: 🔍

Patch: git.kernel.org

Timelineinfo

06/30/2015 🔍
06/30/2015 +0 days 🔍
07/01/2015 +1 days 🔍
07/01/2015 +0 days 🔍
07/08/2015 +7 days 🔍
07/23/2015 +14 days 🔍
07/24/2015 +1 days 🔍
07/28/2015 +4 days 🔍
08/31/2015 +34 days 🔍
05/23/2022 +2457 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-2683-1
Researcher: Salvatore Bonaccorso
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-5364 (🔍)
OVAL: 🔍

X-Force: 104416 - Linux Kernel UDP denial of service
SecurityTracker: 1032794
Vulnerability Center: 51631 - Linux Kernel Remote DoS via Flood of UDP Packets with Invalid Checksums - CVE-2015-5364, High
SecurityFocus: 75510 - Linux Kernel Multiple Remote Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 07/08/2015 09:40
Updated: 05/23/2022 15:07
Changes: 07/08/2015 09:40 (77), 09/21/2018 10:32 (12), 05/23/2022 14:59 (4), 05/23/2022 15:03 (1), 05/23/2022 15:07 (1)
Complete: 🔍

Discussion

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