Cisco Security Advisory
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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:X
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Multiple vulnerabilities in the Cisco Discovery Protocol and Link Layer Discovery Protocol (LLDP) for Cisco ATA 190 Series Analog Telephone Adapter Software could allow an attacker to execute code, cause the service to reload unexpectedly, or cause Cisco Discovery Protocol or LLDP database corruption on an affected device.
Note: Cisco Discovery Protocol and LLDP are a Layer 2 protocols. To exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).
For more information about these vulnerabilities, see the Details section of this advisory.
Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ata19x-multivuln-GEZYVvs
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Vulnerable Products
At the time of publication, these vulnerabilities affected the following Cisco products if they were running a vulnerable release of Cisco ATA 190 Series On-Premises Software or Cisco ATA 190 Series Multiplatform (MPP) Software:
- ATA 190 (On-premises only)
- ATA 191 (On-premises or Multiplatform)
- ATA 192 (Multiplatform only)
For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
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The vulnerabilities are not dependent on one another. Exploitation of one of the vulnerabilities is not required to exploit the other vulnerability. In addition, a firmware release that is affected by one of the vulnerabilities may not be affected by the other vulnerability.
Details about the vulnerabilities are as follows:
CVE-2022-20686, CVE-2022-20687: Cisco ATA 190 Series Analog Telephone Adapter Link Layer Discovery Protocol Firmware Denial of Service Vulnerabilities
Multiple vulnerabilities in the Link Layer Discovery Protocol (LLDP) functionality of Cisco ATA 190 Series Analog Telephone Adapter firmware could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device and cause the LLDP service to restart.
These vulnerabilities are due to missing length validation of certain LLDP packet header fields. An attacker could exploit these vulnerabilities by sending a malicious LLDP packet to an affected device. A successful exploit could allow the attacker to execute code on the affected device and cause LLDP to restart unexpectedly, resulting in a denial of service (DoS) condition.
Cisco has released firmware updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.
Bug ID(s): CSCvz93493, CSCvz91984, CSCvz93504
CVE ID: CVE-2022-20686, CVE-2022-20687
Security Impact Rating (SIR): Medium
CVSS Base Score: 5.3
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LCVE-2022-20688: Cisco ATA 190 Series Analog Telephone Adapter Cisco Discovery Protocol Firmware Denial of Service Vulnerability
A vulnerability in the Cisco Discovery Protocol functionality of Cisco ATA 190 Series Analog Telephone Adapter firmware could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device and cause Cisco Discovery Protocol service to restart.
This vulnerability is due to missing length validation of certain Cisco Discovery Protocol packet header fields. An attacker could exploit these vulnerabilities by sending a malicious Cisco Discovery Protocol packet to an affected device. A successful exploit could allow the attacker to execute code on the affected device and cause Cisco Discovery Protocol to restart unexpectedly, resulting in a DoS condition.
Cisco has released firmware updates that address this vulnerability. There are no workarounds that address this vulnerability.
Bug ID(s): CSCvz93493, CSCvz91984, CSCvz93504
CVE ID: CVE-2022-20688
Security Impact Rating (SIR): Medium
CVSS Base Score: 5.3
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LCVE-2022-20689, CVE-2022-20690: Cisco ATA 190 Series Analog Telephone Adapter Cisco Discovery Protocol Firmware Command Injection Vulnerabilities
Multiple vulnerabilities in the Cisco Discovery Protocol functionality of Cisco ATA 190 Series Analog Telephone Adapter firmware could allow an unauthenticated, adjacent attacker to cause Cisco Discovery Protocol memory corruption on an affected device.
These vulnerabilities are due to missing length validation checks when processing Cisco Discovery Protocol messages. An attacker could exploit these vulnerabilities by sending a malicious Cisco Discovery Protocol packet to an affected device. A successful exploit could allow the attacker to cause an out-of-bounds read of the valid Cisco Discovery Protocol packet data, which could allow the attacker to cause corruption in the internal Cisco Discovery Protocol database of the affected device.
Cisco has released firmware updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.
Bug ID(s): CSCvz93493, CSCvz91984, CSCvz93504
CVE ID: CVE-2022-20689, CVE-2022-20690
Security Impact Rating (SIR): Medium
CVSS Base Score: 5.3
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NCVE-2022-20691: Cisco ATA 190 Series Analog Telephone Adapter Firmware Cisco Discovery Protocol Denial of Service Vulnerability
A vulnerability in the Cisco Discovery Protocol functionality of Cisco ATA 190 Series Adaptive Telephone Adapter firmware could allow an unauthenticated, adjacent attacker to cause a DoS condition of an affected device.
This vulnerability is due to missing length validation of certain Cisco Discovery Protocol packet header fields. An attacker could exploit this vulnerability by sending crafted Cisco Discovery Protocol packets to an affected device. A successful exploit could allow the attacker to cause the device to exhaust available memory and cause the service to restart.
Cisco has released firmware updates that address this vulnerability. There are no workarounds that address this vulnerability.
Bug ID(s):CSCwa24837,CSCwa24842
CVE ID: CVE-2022-20691
Security Impact Rating (SIR): Medium
CVSS Base Score: 5.3
CVSS Vector:CVE-2022-20766: Cisco ATA 190 Series Analog Telephone Adapter Firmware Cisco Discovery Protocol Denial of Service Vulnerability
A vulnerability in the Cisco Discovery Protocol functionality of Cisco ATA 190 Series Adaptive Telephone Adapter firmware could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device.
This vulnerability is due to an out-of-bounds read when processing Cisco Discovery Protocol packets. An attacker could exploit this vulnerability by sending crafted Cisco Discovery Protocol packets to an affected device. A successful exploit could allow the attacker to cause a service restart.
Cisco has released firmware updates that address this vulnerability. There are no workarounds that address this vulnerability.
Bug ID(s): CSCwa24844, CSCwa24849
CVE ID: CVE-2022-20766
Security Impact Rating (SIR): Medium
CVSS Base Score: 5.3
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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There are no workarounds that address these vulnerabilities. However, administrators may disable the affected feature.
To disable Cisco Discovery Protocol or LLDP on the LAN interface of a device, open the web UI and choose Network Setup > Advanced Settings > CDP &LLDP. Then uncheck Enabled CDP or Enabled LLDP.
While this mitigation has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
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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, the release information in the following table(s) was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
Cisco IP Phone Model Cisco Bug IDs Vulnerable Releases First Fixed Release ATA 190 Analog Telephone Adapter CSCvz93493, CSCvz91984, CSCvz93504, CSCwa24837, CSCwa24849 End of software maintenance. No fix available. See the next section. ATA 191 Analog Telephone Adapter CSCvz93493, CSCvz91984, CSCvz93504, CSCwa24837, CSCwa24849 12.0(1)SR4 and earlier 12.0(1)SR5 ATA 191 Multiplatform Analog Telephone Adapter CSCvz93493, CSCvz91984, CSCvz93504, CSCwa24842, 11.2.1 and earlier 11.2.2 ATA 192 Multiplatform Analog Telephone Adapter CSCvz93493, CSCvz91984, CSCvz93504, CSCwa24837, CSCwa24849 11.2.1 and earlier 11.2.2 Cisco ATA 190 Analog Telephone Adapter (CSCvz93493, CSCvz91984, CSCvz93504, CSCwa24837, CSCwa24849)
Cisco has not released and will not release software updates to address these vulnerabilities for Cisco ATA 190 Analog Telephone Adapter because this product has entered the end-of-life process. Customers are advised to refer to the end-of-life notices for the product :
End-of-Sale and End-of-Life Announcement for the Cisco ATA 190 Analog Telephone Adapter
When considering a device migration, 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 new devices will be sufficient for their network needs, that they contain sufficient memory, and current hardware and software configurations will continue to be supported properly by the new product. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.
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The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
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Cisco would like to thank Qian Chen of the Codesafe Team of Legendsec at Qi'anxin Group for reporting these vulnerabilities.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial public release. — Final 2022-OCT-05
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