Vulnerability Report

CVE-2017-1000100

Title: Haxx Libcurl Information Disclosure

Information Disclosure

Proof Of Concept

No public PoC currently indexed for CVE-2017-1000100.

CWE Category CWE-200

Published Date Oct 05, 2017

Modified Date Jun 17, 2026

Exploit Status Not Found

Score 6.5 CVSS v3.0

Exploit Probability (EPSS)

3.96%

Vulnerability Summary

CVE-2017-1000100: 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.

Impacted Vendors

haxx 1

libcurl 1

Reference Links

http://www.debian.org/security/2017/dsa-3992 http://www.securityfocus.com/bid/100286 http://www.securitytracker.com/id/1039118 https://access.redhat.com/errata/RHSA-2018:3558 https://curl.haxx.se/docs/adv_20170809B.html https://security.gentoo.org/glsa/201709-14 https://support.apple.com/HT208221 http://www.debian.org/security/2017/dsa-3992 http://www.securityfocus.com/bid/100286 http://www.securitytracker.com/id/1039118 https://access.redhat.com/errata/RHSA-2018:3558 https://curl.haxx.se/docs/adv_20170809B.html https://security.gentoo.org/glsa/201709-14 https://support.apple.com/HT208221

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity MEDIUM

6.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS v3.0

Source Entity [email protected]

Severity MEDIUM

6.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS v2.0

Source Entity [email protected]

Severity MEDIUM

4.3

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:N/AC:M/Au:N/C:P/I:N/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns