CVE-2017-1000100

NameCVE-2017-1000100
DescriptionWhen 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-1062-1, DSA-3992-1
NVD severitymedium
Debian Bugs871555

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
curl (PTS)stretch7.52.1-5+deb9u10fixed
stretch (security)7.52.1-5+deb9u13fixed
buster7.64.0-4+deb10u1fixed
buster (security)7.64.0-4+deb10u2fixed
bullseye, sid7.74.0-1.2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
curlsourcewheezy7.26.0-1+wheezy20DLA-1062-1
curlsourcejessie7.38.0-4+deb8u6DSA-3992-1
curlsourcestretch7.52.1-5+deb9u1DSA-3992-1
curlsource(unstable)7.55.0-1871555

Notes

https://curl.haxx.se/docs/adv_20170809B.html
https://curl.haxx.se/CVE-2017-1000100.patch

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