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CURL-CVE-2018-1000300
No affected components available
curl might overflow a heap based memory buffer when closing down an FTP connection with long server command replies.
When doing FTP transfers, curl keeps a spare "closure handle" around internally that is used when an FTP connection gets shut down since the original curl easy handle is then already removed.
FTP server response data that gets cached from the original transfer might then be larger than the default buffer size (16 KB) allocated in the "closure handle", which can lead to a buffer overwrite. The contents and size of that overwrite is controllable by the server.
This situation was detected by an assert() in the code, but that was of course only preventing bad stuff in debug builds. This bug is highly unlikely to trigger with non-malicious servers.
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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