https://curl.haxx.se/docs/CVE-2019-5482.html

TFTP small blocksize heap buffer overflow

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Project curl Security Advisory, September 11th 2019 -
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VULNERABILITY
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.
We are not aware of any exploit of this flaw.
INFO
This bug was introduced in January 2009 in commit
0516ce7786e9500c2e44.
The Common Vulnerabilities and Exposures (CVE) project has assigned the name
CVE-2019-5482 to this issue.
CWE-122: Heap-based Buffer Overflow
Severity: 5.2 (Medium)
AFFECTED VERSIONSAffected versions: libcurl >= 7.19.4 to and including 7.65.3
Not affected versions: libcurl < 7.19.4libcurl is used by many applications, but not always advertised as such.
THE SOLUTION
A fix for CVE-2019-5482
RECOMMENDATIONS
We suggest you take one of the following actions immediately, in order of
preference:
A - Upgrade curl to version 7.66.0
B - Apply the patch to your version and rebuild
C - do not use TFTP with curl with smaller than the default BLKSIZE
TIMELINE
The issue was reported to the curl project on August 29, 2019. The fix was done,
verified and communicated with the reporter on September 2, 2019.
We contacted distros@openwall on September 5.
This advisory was posted on September 11th 2019.
CREDITS
Reported and patched by Thomas Vegas.
Thanks a lot!

cURL是一个利用URL语法在命令行下工作的文件传输工具，1997年首次发行。它支持文件上传和下载，所以是综合传输工具，但按传统，习惯称cURL为下载工具

CVE-2019-5482

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