See How to fix? for Debian:9 relevant fixed versions and status. Note: Versions mentioned in the description apply only to the upstream libx11 package and not the libx11 package as distributed by Debian:9. Upgrade Debian:9 curl to version 7.52.1-5+deb9u9 or higher. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header. Such a 'large value' needs to be around 1000 bytes or more. This output data can grow larger than the local buffer if very large 'nt response' data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. The check that exists to prevent the local buffer from getting overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from happening. The function creating an outgoing NTLM type-3 header ( lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()), generates the request HTTP header contents based on previously received data. Libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow. Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Debian:9.
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