Cisco Wide Area Application Services 6.3(1) WAASNET Process Fragmented TCP Packet input validation

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.
5.1	$0-$5k	0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Cisco Wide Area Application Services 6.3(1). This affects an unknown function of the component WAASNET Process. Performing a manipulation as part of Fragmented TCP Packet results in input validation. This vulnerability was named CVE-2017-6721. The attack may be initiated remotely. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Cisco Wide Area Application Services 6.3(1). This affects an unknown code of the component WAASNET Process. The manipulation as part of a Fragmented TCP Packet leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. The summary by CVE is:

A vulnerability in the ingress processing of fragmented TCP packets by Cisco Wide Area Application Services (WAAS) could allow an unauthenticated, remote attacker to cause the WAASNET process to restart unexpectedly, causing a denial of service (DoS) condition. More Information: CSCvc57428. Known Affected Releases: 6.3(1). Known Fixed Releases: 6.3(0.143) 6.2(3c)6 6.2(3.22).

The bug was discovered 06/21/2017. The weakness was presented 07/04/2017 with Cisco as cisco-sa-20170621-waas as confirmed advisory (Website). It is possible to read the advisory at tools.cisco.com. This vulnerability is uniquely identified as CVE-2017-6721 since 03/09/2017. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 12 days. During that time the estimated underground price was around $5k-$25k.

Upgrading to version 6.2(3.22), 6.2(3c)6 or 6.3(0.143) eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 99200†). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Cisco

Name

• Wide Area Application Services

Version

• 6.3(1)

License

• commercial

Website

• Vendor: https://www.cisco.com/

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

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

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
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: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Wide Area Application Services 6.2(3.22)/6.2(3c)6/6.3(0.143)

Timelineinfo

03/09/2017 🔍
06/21/2017 +104 days 🔍
06/21/2017 +0 days 🔍
07/03/2017 +12 days 🔍
07/04/2017 +1 days 🔍
07/04/2017 +0 days 🔍
12/30/2020 +1275 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20170621-waas
Researcher: Cisco
Organization: Cisco
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-6721 (🔍)
GCVE (CVE): GCVE-0-2017-6721
GCVE (VulDB): GCVE-100-103023
SecurityFocus: 99200 - Cisco Wide Area Application Services CVE-2017-6721 Remote Denial of Service Vulnerability
SecurityTracker: 1038747

Entryinfo

Created: 07/04/2017 12:01
Updated: 12/30/2020 15:48
Changes: 07/04/2017 12:01 (63), 10/22/2019 09:09 (5), 12/30/2020 15:44 (3), 12/30/2020 15:48 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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