Your submission was sent successfully! Close

You have successfully unsubscribed! Close

Thank you for signing up for our newsletter!
In these regular emails you will find the latest updates about Ubuntu and upcoming events where you can meet our team.Close

CVE-2017-1000100

Published: 4 October 2017

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.

Priority

Low

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
curl
Launchpad, Ubuntu, Debian
trusty
Released (7.35.0-1ubuntu2.11)
upstream
Released (7.55.0)
artful Not vulnerable
(7.55.1-1ubuntu1)
xenial
Released (7.47.0-1ubuntu2.3)
zesty
Released (7.52.1-4ubuntu1.2)
Patches:
upstream: https://curl.haxx.se/CVE-2017-1000100.patch
upstream: https://github.com/curl/curl/commit/358b2b131ad6c095696f20dcfa62b8305263f898

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N