Cisco IOS Software Precision Time Protocol Denial of Service Vulnerability

A vulnerability in the Precision Time Protocol (PTP) subsystem of Cisco IOS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition of the Precision Time Protocol.

The vulnerability is due to insufficient processing of PTP packets. An attacker could exploit this vulnerability by sending a custom PTP packet to, or through, an affected device. A successful exploit could allow the attacker to cause a DoS condition for the PTP subsystem, resulting in time synchronization issues across the network.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-ptp

This advisory is part of the September 26, 2018, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes 12 Cisco Security Advisories that describe 13 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: September 2018 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.

Security Impact Rating: High

CVE: CVE-2018-0473

Related:

  • No Related Posts

Cisco ASA and FTD Software Cryptographic TLS and SSL Driver Denial of Service Vulnerability

A vulnerability in the cryptographic driver for Cisco Adaptive Security Appliance Software (ASA) and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reboot unexpectedly.

The vulnerability is due to incomplete input validation of a Secure Sockets Layer (SSL) or Transport Layer Security (TLS) ingress packet header. An attacker could exploit this vulnerability by sending a crafted TLS/SSL packet to an interface on the targeted device. An exploit could allow the attacker to cause the device to reload, which will result in a denial of service (DoS) condition.

Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability affects systems configured in routed and transparent firewall mode and in single or multiple context mode. This vulnerability can be triggered by IPv4 and IPv6 traffic. A valid SSL or TLS session is required to exploit this vulnerability.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190710-asa-ftd-dos

Security Impact Rating: High

CVE: CVE-2019-1873

Related:

  • No Related Posts

Cisco Web Security Appliance HTTPS Certificate Denial of Service Vulnerability

A vulnerability in the HTTPS decryption feature of Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability is due to insufficient validation of Secure Sockets Layer (SSL) server certificates. An attacker could exploit this vulnerability by installing a malformed certificate in a web server and sending a request to it through the Cisco WSA. A successful exploit could allow the attacker to cause an unexpected restart of the proxy process on an affected device.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-wsa-dos

Security Impact Rating: High

CVE: CVE-2019-1886

Related:

  • No Related Posts

Cisco Advanced Malware Protection for Endpoints Windows Command Injection Vulnerability

A vulnerability in Cisco Advanced Malware Protection (AMP) for Endpoints for Windows could allow an authenticated, local attacker with administrator privileges to execute arbitrary code.

The vulnerability is due to insufficient validation of dynamically loaded modules. An attacker could exploit this vulnerability by placing a file in a specific location in the Windows filesystem. A successful exploit could allow the attacker to execute the code with the privileges of the AMP service.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-amp-commandinj

Security Impact Rating: Medium

CVE: CVE-2019-1932

Related:

  • No Related Posts

Cisco Nexus 9000 Series Fabric Switches ACI Mode Fabric Infrastructure VLAN Unauthorized Access Vulnerability

A vulnerability in the fabric infrastructure VLAN connection establishment of the Cisco Nexus 9000 Series Application Centric Infrastructure (ACI) Mode Switch Software could allow an unauthenticated, adjacent attacker to bypass security validations and connect an unauthorized server to the infrastructure VLAN.

The vulnerability is due to insufficient security requirements during the Link Layer Discovery Protocol (LLDP) setup phase of the infrastructure VLAN. An attacker could exploit this vulnerability by sending a malicious LLDP packet on the adjacent subnet to the Cisco Nexus 9000 Series Switch in ACI mode. A successful exploit could allow the attacker to connect an unauthorized server to the infrastructure VLAN, which is highly privileged. With a connection to the infrastructure VLAN, the attacker can make unauthorized connections to Cisco Application Policy Infrastructure Controller (APIC) services or join other host endpoints.

Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-n9kaci-bypass

Security Impact Rating: High

CVE: CVE-2019-1890

Related:

  • No Related Posts

Multiple Issues in Cisco Small Business 250/350/350X/550X Series Switches Firmware and Cisco FindIT Network Probe

On June 3, 2019, SEC Consult, a consulting firm for the areas of cyber and application security, contacted the Cisco Product Security Incident Response Team (PSIRT) to report the following issues that they found in firmware images for Cisco Small Business 250 Series Switches:

  • Certificates and keys issued to Futurewei Technologies
  • Empty password hashes
  • Unneeded software packages
  • Multiple vulnerabilities in third-party software (TPS) components

Cisco PSIRT investigated each issue, and the following are the investigation results:

Certificates and Keys Issued to Futurewei Technologies

An X.509 certificate with the corresponding public/private key pair and
the corresponding root CA certificate were found in Cisco Small Business 250 Series Switches firmware. SEC Consult calls this the “House of Keys.” Both certificates are issued to
third-party entity Futurewei Technologies, a Huawei subsidiary.

The certificates and keys in question are part of the Cisco FindIT Network Probe that is bundled with Cisco Small Business 250, 350, 350X, and 550X Series Switches firmware. These files are part of the OpenDaylight open source package. Their intended use is to test the functionality of software using OpenDaylight routines. The Cisco FindIT team used those certificates and keys for their intended testing purpose during the development of the Cisco FindIT Network Probe; they were never used for live functionality in any shipping version of the product. All shipping versions of the Cisco FindIT Network Probe use dynamically created certificates instead. The inclusion of the certificates and keys from the OpenDaylight open source package in shipping software was an oversight by the Cisco FindIT development team.

Cisco has removed those certificates and associated keys from FindIT Network Probe software and Small Business 250, 350, 350X, and 550X Series Switches firmware starting with the releases listed later in this advisory.

Empty Password Hashes

The /etc/passwd file included in Cisco Small Business 250, 350, 350X, and 550X Series Switches firmware has empty password hashes for the users root and user.

The /etc/passwd file is not consulted during user authentication by Small Business 250, 350, 350X, and 550X Series Switches firmware. Instead, a dedicated alternate user database is used to authenticate users that log in to either the CLI or the web-based management interface of Small Business 250, 350, 350X, and 550X Series Switches.

A potential attacker with access to the base operating system on an affected device could exploit this issue to elevate privileges to the root user. However, Cisco is not currently aware of a way to access the base operating system on these switches.

Future firmware releases will replace the empty hashes with hashed, randomly generated passwords during initial boot.

Unneeded Software Packages

An attacker who gains access to the CLI of the base operating system may be able to misuse the gdbserver and tcpdump packages that are included in Cisco Small Business 250, 350, 350X, and 550X Series Switches firmware as part of the base operating system. Cisco is not currently aware of a way to access this part of the system on these switches.

Future firmware releases will not include the gdbserver and tcpdump packages.

Security Impact Rating: Informational

Related:

  • No Related Posts

Cisco Small Business Series Switches HTTP Denial of Service Vulnerability

A vulnerability in the web interface of Cisco Small Business 200, 300, and 500 Series Managed Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.

The vulnerability is due to improper validation of requests sent to the web interface. An attacker could exploit this vulnerability by sending a malicious request to the web interface of an affected device. A successful exploit could allow the attacker to cause an unexpected reload of the device, resulting in a DoS condition.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-sbss-dos

Security Impact Rating: High

CVE: CVE-2019-1891

Related:

  • No Related Posts

Cisco Enterprise NFV Infrastructure Software Arbitrary File Read and Write Vulnerability

A vulnerability in Cisco Enterprise NFV Infrastructure Software (NFVIS) could allow an authenticated, remote attacker with administrator privileges to overwrite or read arbitrary files on the underlying operating system (OS) of an affected device.

The vulnerability is due to improper input validation in NFVIS filesystem commands. An attacker could exploit this vulnerability by using crafted variables during the execution of an affected command. A successful exploit could allow the attacker to overwrite or read arbitrary files on the underlying OS.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-nfvis-file-readwrite

Security Impact Rating: High

CVE: CVE-2019-1894

Related:

  • No Related Posts

Cisco Enterprise NFV Infrastructure Software Command Injection Vulnerability

A vulnerability in Cisco Enterprise NFV Infrastructure Software (NFVIS) could allow an authenticated, local attacker to execute arbitrary commands on the underlying operating system (OS) of an affected device as root.

The vulnerability is due to insufficient input validation of a configuration file that is accessible to a local shell user. An attacker could exploit this vulnerability by including malicious input during the execution of this file. A successful exploit could allow the attacker to execute arbitrary commands on the underlying OS as root.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-nfvis-commandinj

Security Impact Rating: High

CVE: CVE-2019-1893

Related:

  • No Related Posts

Cisco Small Business Series Switches Memory Corruption Vulnerability

A vulnerability in the Secure Sockets Layer (SSL) input packet processor of Cisco Small Business 200, 300, and 500 Series Managed Switches could allow an unauthenticated, remote attacker to cause a memory corruption on an affected device.

The vulnerability is due to improper validation of HTTPS packets. An attacker could exploit this vulnerability by sending a malformed HTTPS packet to the management web interface of the affected device. A successful exploit could allow the attacker to cause an unexpected reload of the device, resulting in a denial of service (DoS) condition.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-sbss-memcorrupt

Security Impact Rating: High

CVE: CVE-2019-1892

Related:

  • No Related Posts