This unpatched DNS bug could put 'well-known' IoT devices at risk

Researchers at IoT security firm Nozomi Networks are warning that a popular library for the C programming language for IoT products is vulnerable to DNS cache-poisoning attacks. The bug is 10 years old and, at present, could not be fixed by its maintainers.

Nozomi security researcher Andrea Palanca discovered that the Domain Name System (DNS) implementation of uClibc and uClibc-ng C libraries used in several popular IoT products generates predictable, incremental transaction identifiers (IDs) in DNS response and request network communications.       

Internet of Things

uClibc stopped being maintained in 2012 after the release of version uClibc-0.9.33.2, while the uClibc-ng fork is designed for use within OpenWRT, a common OS for routers “possibly deployed throughout various critical infrastructure sectors”, according to Palanca.

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uClibc is also known to be used by Linksys, Netgear, and Axis, and Linux distributions, such as Embedded Gentoo, notes Palanca.

Nozomi has opted not to disclose the specific IoT devices it tested because the bug is unpatched. However, Palanca notes the devices tested were “a range of well-known IoT

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