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CURL-CVE-2017-8816
No affected components available
libcurl contains a buffer overrun flaw in the NTLM authentication code.
The internal function Curl_ntlm_core_mk_ntlmv2_hash sums up the lengths of
the username + password (= SUM) and multiplies the sum by two (= SIZE) to
figure out how large storage to allocate from the heap.
The SUM value is subsequently used to iterate over the input and generate
output into the storage buffer. On systems with a 32-bit size_t, the math to
calculate SIZE triggers an integer overflow when the combined lengths of the
username and password is larger than 2GB (2^31 bytes). This integer overflow
usually causes a tiny buffer to actually get allocated instead of the intended
huge one, making the use of that buffer end up in a buffer overrun.
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 very 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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