A security vulnerability discovered and patched 10 years ago has remained unaddressed in various Avaya phones until recently, McAfee security researchers have discovered.
The flaw is a stack-based buffer overflow flaw that exists in the Dynamic Host Configuration Protocol (DHCP) client. Tracked as CVE-2009-0692, the issue could be exploited using malicious DHCP response to crash the ISC DHCP client and execute arbitrary code with the permissions of the client.
The DHCP protocol was designed to allow individual devices on an IP network to get their own network configuration information, such as IP address, subnet mask, and broadcast address.
Avaya, one of the largest Voice-over-IP (VoIP) solutions providers out there, failed to address the issue in some of its devices after it apparently copied and modified a piece of open-source software.
Although the bug affecting the software was reported in 2009, the VoIP provider failed to apply subsequent security patches, thus rendering devices and their users vulnerable.
The existence of this vulnerability in the company’s products remained unnoticed until recently. However, it appears that only the H.323 software stack is affected (the SIP stack that can also be used with these phones is not vulnerable).
A second issue discovered in the Avaya phones was discovered 8 years ago, in 2011. Tracked as CVE-2011-0997, the bug is due to the DHCP client daemon, dhclient, not sufficiently sanitizing certain options provided in DHCP server replies, such as the client hostname. Thus, a malicious DHCP server could send these options with a specially-crafted value to a DHCP client.
“If this option's value was saved on ..
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