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CURL-CVE-2019-3822
No affected components available
libcurl contains a stack based buffer overflow vulnerability.
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. 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.
This output data can grow larger than the local buffer if large response data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server.
Such large response data needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header.
Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.
No exploitation activity has been observed at this time. Continue routine monitoring.
The exploit probability is low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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