Cisco Data Center Network Manager flaws fixed, Cisco ASA appliances under attack
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CVE-2018-0296
KEV PoC ×2massUnauthenticated DoS and Information Disclosure in Cisco ASA HTTP Web Services
CISA: Cisco Adaptive Security Appliance (ASA) Denial-of-Service Vulnerability
CVSS 3.1
7.5 high
EPSS
100%p100
Published
()
KEV added
AI analysis
Cisco Adaptive Security Appliance (ASA) contains an improper input validation flaw (CWE-20) in how the device's HTTP web services process URLs. An unauthenticated, remote attacker can trigger it by sending crafted HTTP URLs to the ASA's web server, with no credentials required. Successful exploitation can crash and reload the appliance (denial of service) and can also disclose sensitive device memory contents (information disclosure). Any organization running an ASA, which is commonly deployed as an enterprise edge firewall and VPN gateway with a web management interface (ASDM), is potentially affected wherever that HTTP service is reachable by untrusted users. The flaw has been exploited in the wild: it was added to CISA's Known Exploited Vulnerabilities catalog on 2021-11-03, and EPSS assigns a 99.9% probability of exploitation within 30 days (percentile 100).
What to do: Apply updates per vendor instructions, upgrading ASA software to a fixed release identified in Cisco's security advisory. Until patched, restrict access to the appliance's HTTP/ASDM service (http server enable) to trusted management networks only, and disable it on any interface that does not require it. Audit internet-facing ASA devices for exposed web interfaces and review logs for anomalous crafted URL requests.
Affected
| Cisco Adaptive Security Appliance (ASA) | — |
Estimated exposure
masshundreds of thousands of internet-exposed ASA devices (ASA is among the most common exposed firewalls in public internet scans) — Cisco ASA is one of the most widely deployed enterprise edge firewalls and VPN gateways, and public internet-wide scans (Shodan/Censys) have long shown ASA/ASDM HTTP interfaces exposed on the open internet at a scale of hundreds of…
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description
A vulnerability in the web interface of the Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. It is also possible on certain software releases that the ASA will not reload, but an attacker could view sensitive system information without authentication by using directory traversal techniques. The vulnerability is due to lack of proper input validation of the HTTP URL. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. An exploit could allow the attacker to cause a DoS condition or unauthenticated disclosure of information. This vulnerability applies to IPv4 and IPv6 HTTP traffic. This vulnerability affects Cisco ASA Software and Cisco Firepower Threat Defense (FTD) Software that is running on the following Cisco products: 3000 Series Industrial Security Appliance (ISA), ASA 1000V Cloud Firewall, ASA 5500 Series Adaptive Security Appliances, ASA 5500-X Series Next-Generation Firewalls, ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, Adaptive Security Virtual Appliance (ASAv), Firepower 2100 Series Security Appliance, Firepower 4100 Series Security Appliance, Firepower 9300 ASA Security Module, FTD Virtual (FTDv). Cisco Bug IDs: CSCvi16029.
CISA Known Exploited Vulnerability
- Affected
- Cisco Adaptive Security Appliance (ASA)
- Required action
- Apply updates per vendor instructions.
- Due date
- Ransomware use
- Unknown
- Vendors
- cisco
- Products
- adaptive security appliance software, firepower threat defense, secure firewall threat defense
- Weakness
- CWE-20, CWE-22
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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