VDB-103585 · CVE-2017-1000020 · GCVE-0-2017-1000020

ECos 1 TCP Packet SYN/FIN Packet improper authentication

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.
7.4	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical has been found in ECos 1. This impacts an unknown function of the component TCP Packet Handler. This manipulation as part of SYN/FIN Packet causes improper authentication. This vulnerability is registered as CVE-2017-1000020. Remote exploitation of the attack is possible. No exploit is available. It is advisable to implement restrictive firewalling.

Detailsinfo

A vulnerability has been found in ECos 1 and classified as critical. Affected by this vulnerability is some unknown processing of the component TCP Packet Handler. The manipulation as part of a SYN/FIN Packet leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect availability. The summary by CVE is:

SYN Flood or FIN Flood attack in ECos 1 and other versions embedded devices results in web Authentication Bypass. "eCos Embedded Web Servers used by Multiple Routers and Home devices, while sending SYN Flood or FIN Flood packets fails to validate and handle the packets and does not ask for any sign of authentication resulting in Authentication Bypass. An attacker can take complete advantage of this bug and take over the device remotely or locally. The bug has been successfully tested and reproduced in some versions of SOHO Routers manufactured by TOTOLINK, GREATEK and others."

The bug was discovered 07/10/2017. The weakness was published 07/17/2017 (Website). The advisory is shared at ecos.sourceware.org. This vulnerability is known as CVE-2017-1000020 since 07/10/2017. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 7 days. During that time the estimated underground price was around $5k-$25k.

Proper firewalling of tcp is able to address this issue.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

ECos

Version

CPE 2.3info

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CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.5

VulDB Base Score: 5.3
VulDB Temp Score: 5.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

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: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

0-Day Time: 🔍

Firewalling: 🔍

Timelineinfo

07/10/2017 🔍
07/10/2017 +0 days 🔍
07/17/2017 +7 days 🔍
07/17/2017 +0 days 🔍
07/17/2017 +0 days 🔍
10/26/2019 +831 days 🔍

Sourcesinfo

Advisory: ecos.sourceware.org
Status: Not defined

CVE: CVE-2017-1000020 (🔍)
GCVE (CVE): GCVE-0-2017-1000020
GCVE (VulDB): GCVE-100-103585

Entryinfo

Created: 07/17/2017 20:20
Updated: 10/26/2019 09:50
Changes: 07/17/2017 20:20 (60), 10/26/2019 09:50 (1)
Complete: 🔍
Cache ID: 216::103