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CURL-CVE-2019-5482
No affected components available
libcurl contains a heap buffer overflow in the function
(tftp_receive_packet()) that receives data from a TFTP server. It can call
recvfrom() with the default size for the buffer rather than with the size
that was used to allocate it. Thus, the content that might overwrite the heap
memory is controlled by the server.
This flaw is only triggered if the TFTP server sends an OACK without the
BLKSIZE option, when a BLKSIZE smaller than 512 bytes was requested by the
TFTP client. OACK is a TFTP extension and is not used by all TFTP servers.
Users choosing a smaller block size than default should be rare as the primary use case for changing the size is to make it larger.
It is rare for users to use TFTP across the Internet. It is most commonly used within local networks. TFTP as a protocol is always inherently insecure.
This issue was introduced by the add of the TFTP BLKSIZE option handling. It
was previously incompletely fixed by an almost identical issue called
CVE-2019-5436.
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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