CVE-2016-9225 Denial of service in all versions of the ASA CX Context-Aware Security module
Unauthenticated remote attackers can cause a denial of service in the Cisco ASA CX module by exhausting packet buffers via crafted IP fragments.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2016-9225?
CVE-2016-9225 is a high-severity denial of service vulnerability in all versions of the ASA CX Context-Aware Security module, published on 1 Feb 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the data plane IP fragment handler of the Cisco Adaptive Security Appliance (ASA) CX Context-Aware Security module could allow an unauthenticated, remote attacker to cause the CX module to be unable to process further traffic, resulting in a denial of service (DoS) condition. The vulnerability is due to improper handling of IP fragments. An attacker could exploit this vulnerability by sending crafted fragmented IP traffic across the CX module. An exploit could allow the attacker to exhaust free packet buffers in shared memory (SHM), causing the CX module to be unable to process further traffic, resulting in a DoS condition. This vulnerability affects all versions of the ASA CX Context-Aware Security module. Cisco has not released and will not release software updates that address this vulnerability. There are no workarounds that address this vulnerability. Cisco Bug IDs: CSCva62946.
Weakness: CWE-399
Which versions are affected by CVE-2016-9225?
It affects 1 product.
Products include Cisco Asa Cx Context-Aware Security Software.
How do I fix CVE-2016-9225?
No fix has been published for CVE-2016-9225 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2016-9225 being exploited?
There is no known exploitation of CVE-2016-9225 in the wild and no public exploit code.
Other vulnerabilities in all versions of the ASA CX Context-Aware Security module
Sources
Also known as GHSA-847f-22gw-x6h3.