Updates released by Cisco for the AsyncOS operating system powering the company’s Web Security Appliance (WSA) address several high severity denial-of-service (DoS) vulnerabilities.
One of the vulnerabilities (CVE-2016-1380) is caused by the lack of proper input validation for packets in an HTTP POST request. A remote, unauthenticated attacker can cause the appliance to reload by sending it a specially crafted HTTP POST request.
The second security hole (CVE-2016-1383) is related to how the operating system handles certain HTTP response code. An unauthenticated attacker can remotely cause a DoS condition by sending a specially crafted HTTP request to the targeted device, causing it to run out of memory.
AsyncOS for Cisco WSA is also plagued by a cached file-range request issue (CVE-2016-1381) that can be exploited for a DoS attack by opening multiple connections that request file ranges through the vulnerable appliance.
Another problem identified by Cisco is related to the improper allocation of space for the HTTP header and any expected HTTP payload (CVE-2016-1382). A malicious actor can exploit this to cause a DoS condition when the proxy process restarts unexpectedly, Cisco said.
The flaws affect various versions of AsyncOS for WSA on both hardware and virtual appliances. In addition to software updates that resolve these issues, workarounds are also available in some cases.
All of the vulnerabilities were found by Cisco while resolving a support case and the company says there is no evidence of malicious exploitation.
Cisco also informed customers on Wednesday that a PoC exploit has been made available by researchers for a critical remote code execution vulnerability affecting the IKEv1 and IKEv2 in ASA software.
Related: Malware Detection Bypass Vulnerability Found in Cisco Firepower
Related: Cisco Patches Critical, High Severity Flaws in NX-OS
Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.
More from Eduard Kovacs
- Intel Boasts Attack Surface Reduction With New 13th Gen Core vPro Platform
- Dole Says Employee Information Compromised in Ransomware Attack
- High-Severity Vulnerabilities Found in WellinTech Industrial Data Historian
- CISA Expands Cybersecurity Committee, Updates Baseline Security Goals
- Exploitation of 55 Zero-Day Vulnerabilities Came to Light in 2022: Mandiant
- Organizations Notified of Remotely Exploitable Vulnerabilities in Aveva HMI, SCADA Products
- Waterfall Security, TXOne Networks Launch New OT Security Appliances
- Hitachi Energy Blames Data Breach on Zero-Day as Ransomware Gang Threatens Firm
Latest News
- Intel Co-founder, Philanthropist Gordon Moore Dies at 94
- Google Leads $16 Million Investment in Dope.security
- US Charges 20-Year-Old Head of Hacker Site BreachForums
- Tesla Hacked Twice at Pwn2Own Exploit Contest
- CISA Ships ‘Untitled Goose Tool’ to Hunt for Microsoft Azure Cloud Infections
- Critical WooCommerce Payments Vulnerability Leads to Site Takeover
- PoC Exploit Published for Just-Patched Veeam Data Backup Solution Flaw
- CISA Gets Proactive With New Pre-Ransomware Alerts
