CVE-2017-1000100
curl - security update
Description
When doing a TFTP transfer and curl/libcurl is given a URL that contains a very long file name (longer than about 515 bytes), the file name is truncated to fit within the buffer boundaries, but the buffer size is still wrongly updated to use the untruncated length. This too large value is then used in the sendto() call, making curl attempt to send more data than what is actually put into the buffer. The endto() function will then read beyond the end of the heap based buffer. A malicious HTTP(S) server could redirect a vulnerable libcurl-using client to a crafted TFTP URL (if the client hasn't restricted which protocols it allows redirects to) and trick it to send private memory contents to a remote server over UDP. Limit curl's redirect protocols with --proto-redir and libcurl's with CURLOPT_REDIR_PROTOCOLS.
How to fix CVE-2017-1000100
To remediate CVE-2017-1000100, upgrade the affected package to a fixed version below.
- —upgrade to 7.55.0-r0 or later
- —upgrade to 7.55.0-1 or later
- —upgrade to 7.26.0-1+wheezy20 or later
- —upgrade to 7.38.0-4+deb8u6 or later
Is CVE-2017-1000100 being exploited?
Low — EPSS is 0.6%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 7.55.0-r0
- from 0, < 7.55.0-1
- from 0, < 7.26.0-1+wheezy20
- from 0, < 7.38.0-4+deb8u6
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |