CyberRota Analysis
AI-GeneratedThe nscd service in the GNU C Library is vulnerable to a stack overflow caused by excessively large DNS responses from untrusted DNS servers, which can lead to crashes and degraded DNS resolution performance. While exploitation requires specific conditions, such as having nscd enabled and using a vulnerable DNS server, there is a risk of cache corruption that could affect other nscd caches. Organizations utilizing the GNU C Library with nscd enabled should prioritize addressing this vulnerability to mitigate potential performance issues and ensure reliable DNS resolution.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
The nscd service in the GNU C Library 2.3.4 onwards may crash due to a stack overflow when a malicious DNS server returns too large a response for a DNS query, resulting in degraded DNS resolution for the system. Exploitation of this bug needs a system that has nscd enabled and using an untrusted DNS server for name resolution, with the compromised DNS server being capable of processing records large enough to result in a stack overflow in an nscd thread stack. During experimentation, bind 9 was unable to handle large records, but that could change in future or with a different name server. In typical installations, nscd is executed in an isolated context as its own user without a shell, due to which any compromise of that service is isolated. There is a remote possibility of nscd cache corruption if an attacker manages to get the stack pointer into a desired point in the heap, potentially resulting in other caches in nscd being overwritten with corrupt data through the stack overflow, until the buggy code path eventually results in a crash. Finally, a crash in nscd may result in performance degradation when resolving names, but it does not result in a denial of service.