cisco-sa-20190703-asyncos-wsa: Cisco Web Security Appliance Web Proxy Denial of Service Vulnerability
First published: Wed Jul 03 2019(Updated: )
A vulnerability in the web proxy functionality of Cisco AsyncOS Software for Cisco Web Security Appliance (WSA) could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient input validation mechanisms for certain fields in HTTP/HTTPS requests sent through an affected device. A successful attacker could exploit this vulnerability by sending a malicious HTTP/HTTPS request through an affected device. An exploit could allow the attacker to force the device to stop processing traffic, resulting in a DoS condition. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-asyncos-wsa
Credit: This vulnerability was found during the resolution a Cisco TAC support case
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco AsyncOS Software | =11.7<11.7.0-407=11.5<11.5.2-020=10.5<10.5.5-005=10.1<10.5.5-005 | 11.7.0-407 11.5.2-020 10.5.5-005 10.5.5-005 |
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Reference Links
Frequently Asked Questions
What is the severity of cisco-sa-20190703-asyncos-wsa?
The severity of cisco-sa-20190703-asyncos-wsa is high due to its potential to cause a denial of service condition.
How do I fix cisco-sa-20190703-asyncos-wsa?
To fix cisco-sa-20190703-asyncos-wsa, upgrade to a patched version of Cisco AsyncOS Software.
Who is affected by cisco-sa-20190703-asyncos-wsa?
Cisco AsyncOS Software users on versions below 11.7.0-407, 11.5.2-020, and 10.5.5-005 are affected by cisco-sa-20190703-asyncos-wsa.
What might an attacker be able to do with cisco-sa-20190703-asyncos-wsa?
An attacker exploiting cisco-sa-20190703-asyncos-wsa could cause a denial of service on the affected device.
Is cisco-sa-20190703-asyncos-wsa a remote vulnerability?
Yes, cisco-sa-20190703-asyncos-wsa is a remote vulnerability that requires authenticated access to exploit.
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