Headline
CVE-2021-1223: Cisco Security Advisory: Multiple Cisco Products Snort HTTP Detection Engine File Policy Bypass Vulnerability
Multiple Cisco products are affected by a vulnerability in the Snort detection engine that could allow an unauthenticated, remote attacker to bypass a configured file policy for HTTP. The vulnerability is due to incorrect handling of an HTTP range header. An attacker could exploit this vulnerability by sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker to bypass configured file policy for HTTP packets and deliver a malicious payload.
When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page, to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
Fixed Releases
At the time of publication, Cisco Firepower Threat Defense (FTD) releases 6.7.0 and later contained the fix for this vulnerability.
At the time of publication, Cisco UTD Snort IPS Engine Software for IOS XE 17.4.11 contained the fix for this vulnerability.
At the time of publication, open source Snort project releases 2.9.17 and later contained the fix for this vulnerability. For more information, see the Snort website.
See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
1. Starting in 17.2.1, IOS XE and IOS XE SD-WAN use the same image file.
Related news
Debian Linux Security Advisory 5354-1 - Multiple security vulnerabilities were discovered in snort, a flexible Network Intrusion Detection System, which could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or bypass filtering technology on an affected device and ex-filtrate data from a compromised host.