CyberRota Analysis
AI-GeneratedUnbound versions 1.25.0 to 1.25.1 are vulnerable due to a flaw in the interaction between the 'respip' and 'dns64' modules, which can lead to memory corruption under specific conditions when the server is under pressure. This vulnerability primarily affects configurations using these modules alongside 'access-control-view', potentially causing instability or crashes, particularly in environments with high query loads. Organizations utilizing Unbound with these configurations should prioritize applying updates to mitigate the risk of memory corruption and ensure system stability.
Original NVD Description
In NLnet Labs Unbound 1.25.0 up to and including 1.25.1, a fix that makes the 'respip' and 'dns64' modules work together, creates a shallow copy of the view name in effect that could lead to memory corruption if the owner of the original view name is jostled out when Unbound is under pressure. Unbound needs to be configured with one of 'respip'/'rpz' modules, together with a module that can attach subqueries (respip CNAME redirection, dns64, subnetcache) and a configured 'access-control-view' while Unbound is under pressure so that joslte logic kicks in and starts dropping slow queries. The subquery is getting a shallow copy of the view name and if the super query which owns the view name is jostled out, memory corruption can occur. Likelihood of a crash is low, since it relies heavily on the underlying memory allocator and the memory layout. Debug memory builds (e.g., ASAN) that catch the free terminate the server.
Related CVEs
Other vulnerabilities affecting the same vendor(s)