Cisco AsyncOS/Web Security Appliance Proxy TCP Connection resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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6.8$0-$5k0.00

Summaryinfo

A vulnerability was found in Cisco AsyncOS and Web Security Appliance. It has been classified as problematic. This vulnerability affects unknown code of the component Proxy. The manipulation as part of TCP Connection leads to resource consumption. This vulnerability is traded as CVE-2018-0410. It is possible to initiate the attack remotely. There is no exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Cisco AsyncOS and Web Security Appliance (Anti-Malware Software) (unknown version). It has been rated as problematic. This issue affects an unknown code block of the component Proxy. The manipulation as part of a TCP Connection leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

A vulnerability in the web proxy functionality of Cisco AsyncOS Software for Cisco Web Security Appliances could allow an unauthenticated, remote attacker to exhaust system memory and cause a denial of service (DoS) condition on an affected system. The vulnerability exists because the affected software improperly manages memory resources for TCP connections to a targeted device. An attacker could exploit this vulnerability by establishing a high number of TCP connections to the data interface of an affected device via IPv4 or IPv6. A successful exploit could allow the attacker to exhaust system memory, which could cause the system to stop processing new connections and result in a DoS condition. System recovery may require manual intervention. Cisco Bug IDs: CSCvf36610.

The bug was discovered 08/15/2018. The weakness was shared 08/15/2018 as cisco-sa-20180815-wsa-dos as confirmed advisory (Website). It is possible to read the advisory at tools.cisco.com. The identification of this vulnerability is CVE-2018-0410 since 11/26/2017. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 112121 (Cisco Web Security Appliance Multiple Vulnerabilities.), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316307 (Cisco Web Security Appliance Web Proxy Memory Exhaustion Denial of Service Vulnerability(cisco-sa-20180815-wsa-dos)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published 2 hours after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (112121) and SecurityFocus (BID 105098†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.8

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

NVD Base Score: 8.6
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 112121
Nessus Name: Cisco Web Security Appliance Multiple Vulnerabilities.
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Timelineinfo

11/26/2017 🔍
08/15/2018 +261 days 🔍
08/15/2018 +0 days 🔍
08/15/2018 +0 days 🔍
08/15/2018 +0 days 🔍
08/15/2018 +0 days 🔍
08/16/2018 +1 days 🔍
08/27/2018 +11 days 🔍
05/02/2023 +1709 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20180815-wsa-dos
Status: Confirmed

CVE: CVE-2018-0410 (🔍)
GCVE (CVE): GCVE-0-2018-0410
GCVE (VulDB): GCVE-100-122939
SecurityFocus: 105098 - Cisco AsyncOS Software CVE-2018-0410 Denial Of Service Vulnerability
SecurityTracker: 1041535

Entryinfo

Created: 08/16/2018 06:21
Updated: 05/02/2023 09:52
Changes: 08/16/2018 06:21 (54), 03/16/2020 07:06 (11), 05/02/2023 09:48 (3), 05/02/2023 09:52 (11)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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