CVE-2017-1000100 (GCVE-0-2017-1000100)
Vulnerability from cvelistv5 – Published: 2017-10-04 01:00 – Updated: 2026-04-16 13:34
VLAI
EPSS
VEX
Summary
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.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-16 13:34 UTC
CWE
- n/a
- CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://support.apple.com/HT208221 | x_refsource_CONFIRM |
| http://www.securityfocus.com/bid/100286 | vdb-entryx_refsource_BID |
| https://access.redhat.com/errata/RHSA-2018:3558 | vendor-advisoryx_refsource_REDHAT |
| https://security.gentoo.org/glsa/201709-14 | vendor-advisoryx_refsource_GENTOO |
| http://www.securitytracker.com/id/1039118 | vdb-entryx_refsource_SECTRACK |
| https://curl.haxx.se/docs/adv_20170809B.html | x_refsource_CONFIRM |
| http://www.debian.org/security/2017/dsa-3992 | vendor-advisoryx_refsource_DEBIAN |
Date Public
2017-10-03 00:00
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"value": "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\u0027t restricted which protocols it allows redirects to) and trick it to send private memory contents to a remote server over UDP. Limit curl\u0027s redirect protocols with --proto-redir and libcurl\u0027s with CURLOPT_REDIR_PROTOCOLS."
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"value": "A la hora de hacer una transferencia TFTP y proporcionar una URL con un nombre de archivo muy grande (mayor que 515 bytes) en curl/libcurl, el nombre de archivo se trunca para que entre en los l\u00edmites del b\u00fafer, pero el tama\u00f1o del b\u00fafer se sigue actualizando err\u00f3neamente para usar la longitud no truncada. Este valor excesivamente grande se utiliza luego en la llamada sendto(), lo que hace que un intento curl env\u00ede m\u00e1s datos que los que est\u00e1n realmente puestos en el b\u00fafer. La funci\u00f3n endto() lee entonces m\u00e1s all\u00e1 del final del b\u00fafer basado en la memoria din\u00e1mica (heap). Un servidor HTTP(S) malicioso podr\u00eda redirigir un cliente vulnerable que utiliza libcurl a una URL TFTP manipulada (si el cliente no tuviese restringidos a qu\u00e9 protocolos se permiten redirecciones) y enga\u00f1arle para que env\u00ede contenidos privados de la memoria a un servidor remoto por UDP. Limite los protocolos de redirecci\u00f3n de curl con --proto-redir y los de libcurl, con CURLOPT_REDIR_PROTOCOLS."
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"name": "RHSA-2018:3558",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2018:3558"
},
{
"name": "GLSA-201709-14",
"tags": [
"vendor-advisory",
"x_refsource_GENTOO"
],
"url": "https://security.gentoo.org/glsa/201709-14"
},
{
"name": "1039118",
"tags": [
"vdb-entry",
"x_refsource_SECTRACK"
],
"url": "http://www.securitytracker.com/id/1039118"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://curl.haxx.se/docs/adv_20170809B.html"
},
{
"name": "DSA-3992",
"tags": [
"vendor-advisory",
"x_refsource_DEBIAN"
],
"url": "http://www.debian.org/security/2017/dsa-3992"
}
],
"x_legacyV4Record": {
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"DATE_ASSIGNED": "2017-08-22T17:29:33.315894",
"ID": "CVE-2017-1000100",
"REQUESTER": "daniel@haxx.se",
"STATE": "PUBLIC"
},
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"vendor": {
"vendor_data": [
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"refsource": "CONFIRM",
"url": "https://support.apple.com/HT208221"
},
{
"name": "100286",
"refsource": "BID",
"url": "http://www.securityfocus.com/bid/100286"
},
{
"name": "RHSA-2018:3558",
"refsource": "REDHAT",
"url": "https://access.redhat.com/errata/RHSA-2018:3558"
},
{
"name": "GLSA-201709-14",
"refsource": "GENTOO",
"url": "https://security.gentoo.org/glsa/201709-14"
},
{
"name": "1039118",
"refsource": "SECTRACK",
"url": "http://www.securitytracker.com/id/1039118"
},
{
"name": "https://curl.haxx.se/docs/adv_20170809B.html",
"refsource": "CONFIRM",
"url": "https://curl.haxx.se/docs/adv_20170809B.html"
},
{
"name": "DSA-3992",
"refsource": "DEBIAN",
"url": "http://www.debian.org/security/2017/dsa-3992"
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"datePublished": "2017-10-04T01:00:00.000Z",
"dateReserved": "2017-10-03T00:00:00.000Z",
"dateUpdated": "2026-04-16T13:34:51.252Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.