CyberRota Analysis
AI-GeneratedThe vulnerability affects NLnet Labs Unbound versions up to 1.26.0, where improper handling of CNAME synthesis can lead to heap memory corruption and potentially remote code execution under certain configurations. This issue arises from a flaw in managing the packet buffer during TTL enforcement, which can result in a heap buffer overflow. Organizations using affected versions of Unbound should prioritize patching this vulnerability due to its high severity and the risk of exploitation.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in that can progressively corrupt heap memory and under certain systems and compilation options could lead to remote code execution. The vulnerability starts when CNAME synthesis during an upstream response needs to enforce(rewrite) a max TTL value in the packet buffer. Coupled with a compression pointer that points to the overwritten value and invalidates the domain name, it leads to an error path that does not properly move the buffer position and allows for the heap buffer overflow. Since this is heavily reliant on heap memory layout, results are memory corruption that eventually leads to a crash and under specific systems and compilation options remote code execution.
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