CVE-2019-3822 log

Severity High
Remote Yes
Type Arbitrary code execution
libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow. 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 very large "nt response" data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. Such a "large value" 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.
Group Package Affected Fixed Severity Status Ticket
AVG-877 libcurl-gnutls 7.63.0-2 7.64.0-1 High Fixed
AVG-876 lib32-libcurl-gnutls 7.63.0-2 7.64.0-1 High Fixed
AVG-875 lib32-libcurl-compat 7.63.0-2 7.64.0-1 High Fixed
AVG-874 lib32-curl 7.63.0-2 7.64.0-1 High Fixed
AVG-873 curl 7.63.0-4 7.64.0-1 High Fixed
Date Advisory Group Package Severity Type
12 Feb 2019 ASA-201902-9 AVG-873 curl High arbitrary code execution
12 Feb 2019 ASA-201902-13 AVG-874 lib32-curl High arbitrary code execution
12 Feb 2019 ASA-201902-12 AVG-875 lib32-libcurl-compat High arbitrary code execution
12 Feb 2019 ASA-201902-11 AVG-876 lib32-libcurl-gnutls High arbitrary code execution
12 Feb 2019 ASA-201902-10 AVG-877 libcurl-gnutls High arbitrary code execution
Turn off NTLM authentication as workaround