Cisco ATA 187 Analog Telephone Adapter firmware versions 220.127.116.11 and 18.104.22.168 contain a vulnerability that could allow an unauthenticated, remote attacker to access the operating system of a targeted device. Updates are available.
Cisco ATA 187 Analog Telephone Adaptor firmware versions 22.214.171.124 and 126.96.36.199 contain a vulnerability that could allow an unauthenticated, remote attacker to access the operating system of the affected device.
The vulnerability is due to improper validation of authentication on TCP port 7870 and improper authorization of commands within the operating system. An attacker could exploit this vulnerability by connecting to the affected system and sending arbitrary commands.
Cisco has confirmed the vulnerability in a security advisory and released software updates.
Cisco ATA 187 Analog Telephone Adaptor versions 188.8.131.52 and 184.108.40.206 are vulnerable.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
A remote attacker could exploit the vulnerability to access sensitive information, create files, or cause a denial of service (DoS) condition for legitimate users.
The vulnerability exists because the affected software performs insufficient validation of user access credentials when handling Telnet connections to TCP port 7870.
A remote attacker could exploit the vulnerability by establishing an unauthenticated Telnet session on TCP port 7870 of a targeted device and issuing arbitrary commands to the operating system of a targeted device. The ability to issue arbitrary commands could allow the attacker to access sensitive information, create files, or cause a DoS condition for legitimate users.
Administrators are advised to apply the appropriate updates.
Administrators may consider disabling remote Telnet access to affected devices.
Administrators are advised to monitor affected systems.
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at firstname.lastname@example.org.
The security vulnerability applies to the following combinations of products.
Cisco ATA 187 Analog Telephone Adaptor
9.2 .1.0, .3.1
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