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CURL-CVE-2019-5481
No affected components available
libcurl can be told to use kerberos over FTP to a server, as set with the
CURLOPT_KRBLEVEL option.
During such kerberos FTP data transfer, the server sends data to curl in blocks with the 32-bit size of each block first and then that amount of data immediately following.
A malicious or broken server can claim to send a large block and if by doing
that it makes curl's subsequent call to realloc() to fail, curl would then
misbehave in the exit path and double free the memory.
In practical terms, an up to 4 GB memory area may well be fine to allocate on a modern 64-bit system but on 32-bit systems it fails.
Kerberos FTP is a rarely used protocol with curl. Also, Kerberos authentication is usually only attempted and used with servers that the client has a previous association with.
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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