Cisco Adaptive Security Appliance (ASA) Software vulnerabilities

The DHCPv6 relay implementation in Cisco Adaptive Security Appliance (ASA) Software 9.4.1 allows remote attackers to cause a denial of service (device reload) via crafted DHCPv6 packets.

The XML parser in Cisco Adaptive Security Appliance (ASA) Software before version 8.4(7.28), 8.6(1.17), 9.0(4.33), 9.1(6), 9.2(3.4), and 9.3(3) is vulnerable to an attack that can lead to denial of service via a crafted XML document. This attack can result in VPN outages or device reloads.

The DNS implementation in Cisco Adaptive Security Appliance (ASA) Software before versions 7.2(5.16), 8.2(5.57), 8.3(2.44), 8.4(7.28), 8.5(1.24), 8.6(1.17), 8.7(1.16), 9.0(4.33), 9.1(6.1), 9.2(3.4), and 9.3(3) is vulnerable to man-in-the-middle attacks that can lead to denial of service by triggering DNS queries and sending crafted responses.

The failover IPsec implementation in Cisco Adaptive Security Appliance (ASA) Software before version 9.1(6), 9.2(3.3), and 9.3(3) does not properly validate failover communication messages, allowing remote attackers to reconfigure an ASA device.

The SIP inspection engine in Cisco Adaptive Security Appliance (ASA) Software before versions 8.2(5.48), 8.4(6.5), 9.0(3.1), and 9.1(2.5) allows remote attackers to cause a denial of service via crafted SIP packets.

Cisco Adaptive Security Appliance (ASA) Software versions before 8.2(5.48), 8.3 before 8.3(2.40), 8.4 before 8.4(7.9), 8.6 before 8.6(1.13), 9.0 before 9.0(4.1), and 9.1 before 9.1(4.3) does not properly process management-session information during privilege validation for SSL VPN portal connections. This allows remote authenticated users to gain privileges by establishing a Clientless SSL VPN session and entering crafted URLs.

Cisco Adaptive Security Appliance (ASA) Software versions before 8.2(5.47), 8.4(7.5), 8.7(1.11), 9.0(3.10), and 9.1(3.4) allows remote authenticated users to gain privileges by leveraging level-0 ASDM access.

A vulnerability in the Internet Key Exchange version 2 (IKEv2) protocol processing of Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense (FTD) Software, Cisco IOS Software, and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The issue is due to insufficient input validation when processing IKEv2 messages. Sending crafted IKEv2 traffic can cause the device to reload, resulting in a DoS condition.

A vulnerability in the Internet Key Exchange version 2 (IKEv2) protocol for VPN termination of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The issue is due to insufficient input validation. Sending crafted IKEv2 traffic can cause the device to reload, resulting in a DoS condition.

A vulnerability in the VPN web client services feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a browser accessing an affected device. The issue is due to improper validation of user-supplied input to application endpoints.

A vulnerability in the session authentication functionality of the Remote Access SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to prevent users from authenticating. This is due to insufficient entropy in the authentication process. An attacker could exploit this by determining the handle of an authenticating user and using it to terminate their authentication session, forcing a restart.

A vulnerability in the Simple Network Management Protocol (SNMP) feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to cause an unexpected reload of the device. The issue is due to insufficient input validation of SNMP packets. Sending a crafted SNMP request over IPv4 or IPv6 can cause the device to reload, resulting in a DoS condition. This affects all SNMP versions (1, 2c, 3) and requires a valid SNMP community string or valid SNMPv3 user credentials.

A vulnerability in the implementation of SAML 2.0 single sign-on (SSO) for remote access VPN services in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to successfully establish a VPN session on an affected device. The issue is due to improper separation of authorization domains when using SAML authentication.

A vulnerability in the activation of an access control list (ACL) on Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the protection offered by a configured ACL. The issue is due to a logic error when an ACL changes from inactive to active in the running configuration.

A vulnerability in the restore functionality of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to execute arbitrary commands on the underlying operating system with root-level privileges. Administrator-level privileges are required. The issue is due to improper sanitization of backup file contents during restore. An attacker could exploit this by restoring a crafted backup file.

A vulnerability in the implementation of Security Assertion Markup Language (SAML) 2.0 single sign-on (SSO) for remote access VPN in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to intercept the SAML assertion of a user authenticating to a remote access VPN session. The issue is due to insufficient validation of the login URL.

A vulnerability in the remote access VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The issue is due to improper handling of HTTPS requests. Sending crafted HTTPS requests can cause resource exhaustion, resulting in a DoS condition.

A vulnerability in the AnyConnect SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This is due to an implementation error in SSL/TLS session handling that can prevent the release of a session handler under specific conditions. An attacker could exploit this by sending crafted SSL/TLS traffic, increasing the probability of session handler leaks and eventually depleting the available pool.

A vulnerability in ICMPv6 processing of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The issue is due to improper processing of ICMPv6 messages. Sending crafted ICMPv6 messages to a system with IPv6 enabled can cause the device to reload.

A vulnerability in the IPv6 DHCP (DHCPv6) client module of Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense (FTD) Software, Cisco IOS Software, and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This is due to insufficient validation of DHCPv6 messages. An attacker could exploit this by sending crafted DHCPv6 messages, causing the device to reload. To exploit, the attacker needs to control the DHCPv6 server or be in a man-in-the-middle position.

A vulnerability in the authentication and authorization flows for VPN connections in Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to establish a connection as a different user. This is due to a flaw in authorization verifications during the VPN authentication flow. An attacker with valid credentials could send a crafted packet during authentication, gaining access with another user's privileges.

A vulnerability in the DNS inspection handler of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. It is due to a lack of proper processing of incoming requests. An attacker could exploit this by sending crafted DNS requests at a high rate to an affected device.

A vulnerability in the Datagram TLS (DTLS) protocol implementation in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause high CPU utilization, resulting in a denial of service (DoS) condition. This is due to suboptimal processing when establishing a DTLS tunnel as part of an AnyConnect SSL VPN connection. An attacker could exploit this by sending a steady stream of crafted DTLS traffic, exhausting resources on the device.

A vulnerability in the web services interface of Cisco ASA and FTD Software could allow an unauthenticated, remote attacker to trigger a DoS condition. It is due to improper input validation when parsing HTTPS requests. An attacker can send a malicious HTTPS request to cause the device to reload, resulting in DoS.

A vulnerability in the web services interface of Cisco ASA and FTD Software could allow an unauthenticated, remote attacker to trigger a DoS condition. It is due to improper input validation when parsing HTTPS requests. An attacker can send a malicious HTTPS request to cause the device to reload, resulting in DoS.

A vulnerability in the web services interface of Cisco ASA and FTD Software could allow an unauthenticated, remote attacker to trigger a DoS condition. It is due to improper input validation when parsing HTTPS requests. An attacker can send a malicious HTTPS request to cause the device to reload, resulting in DoS.

A vulnerability in the TCP Normalizer of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software operating in transparent mode could allow an unauthenticated, remote attacker to poison MAC address tables, resulting in a denial of service (DoS) vulnerability. The issue is due to incorrect handling of certain TCP segments in transparent mode. Sending a crafted TCP segment can poison MAC tables in adjacent devices, causing network disruption.

Multiple vulnerabilities in the Application Level Gateway (ALG) for the Network Address Translation (NAT) feature of Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the ALG and open unauthorized connections with a host behind the ALG. These vulnerabilities are publicly known as NAT Slipstreaming.

Multiple vulnerabilities in the Application Level Gateway (ALG) for the Network Address Translation (NAT) feature of Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the ALG and open unauthorized connections with a host behind the ALG. These vulnerabilities are publicly known as NAT Slipstreaming.

Multiple vulnerabilities in Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. These are due to lack of proper input validation of HTTPS requests. An attacker could exploit these by sending a crafted HTTPS request to an affected device. This affects only specific AnyConnect and WebVPN configurations.

A vulnerability in the SIP inspection engine of Cisco ASA and FTD Software could allow an unauthenticated, remote attacker to cause a crash and reload of an affected device, resulting in DoS. The issue is a crash during a hash lookup for a SIP pinhole connection. An attacker can send crafted SIP traffic to trigger the crash and reload.

Multiple vulnerabilities in Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. These are due to lack of proper input validation of HTTPS requests. An attacker could exploit these by sending a crafted HTTPS request to an affected device. This affects only specific AnyConnect and WebVPN configurations.

Multiple vulnerabilities in the web services interface of Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct cross-site scripting (XSS) attacks against a user of the interface. The vulnerabilities are due to insufficient validation of user-supplied input. An attacker could exploit these by persuading a user to click a crafted link.

Multiple vulnerabilities in the web services interface of Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct cross-site scripting (XSS) attacks against a user of the interface. The vulnerabilities are due to insufficient validation of user-supplied input. An attacker could exploit these by persuading a user to click a crafted link.

Multiple vulnerabilities in the web services interface of Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct cross-site scripting (XSS) attacks against a user of the interface. The vulnerabilities are due to insufficient validation of user-supplied input. An attacker could exploit these by persuading a user to click a crafted link.

A vulnerability in the SSL/TLS session handler of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. It is due to a memory leak when closing SSL/TLS connections in a specific state. An attacker could exploit this by establishing several SSL/TLS sessions and ensuring they are closed under certain conditions.

A vulnerability in the Clientless SSL VPN (WebVPN) portal of Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the web-based management interface. The issue is due to insufficient validation of user-supplied input. An attacker could exploit this by persuading a user to click a crafted link.

A vulnerability in the FTP inspection engine of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. It is due to insufficient validation of FTP data. An attacker could exploit this by sending malicious FTP traffic through the device.

A vulnerability in the detection engine of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to send data directly to the kernel of an affected device. The issue is due to improper filtering of Ethernet frames. An attacker could exploit this by sending crafted packets to the management interface, bypassing Layer 2 filters.