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CVE-2017-1000100

6.5 · MEDIUM

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…

Published Oct 5, 2017CWE-200EPSS 3.96%

Overview

CVE-2017-1000100 is a medium-severity vulnerability. It was published on October 5, 2017 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.debian.org/security/2017/dsa-3992Refwww.securityfocus.com/bid/100286Refwww.securitytracker.com/id/1039118Refaccess.redhat.com/errata/RHSA-2018:3558Refcurl.haxx.se/docs/adv_20170809B.htmlRefsecurity.gentoo.org/glsa/201709-14Refsupport.apple.com/HT208221Refwww.debian.org/security/2017/dsa-3992Refwww.securityfocus.com/bid/100286Refwww.securitytracker.com/id/1039118

How CyberStrike helps

Frequently asked questions

What is CVE-2017-1000100?

CVE-2017-1000100 is a medium-severity vulnerability. It was published on October 5, 2017 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2017-1000100?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2017-1000100?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2017-1000100?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-1000100 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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