CVE-2017-1000100
mediumpriority · track · 27EPSS 0.040 · 90 %ileDEEURUUSEPSS · scored 2026-10-27
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.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- Fixedphoenix_contact_psirt
Update to Firmware Release 2019.0 LTS or later. Update to PLCnext Engineer Release 2019.0 LTS or later. Update A, 30.08.2019 With Firmware Release 2019.6 an option was added to the web-based management that allows the user to permanently disable storage of configuration data to the SD-Card. The device can now be operated without SD-Card and ignores any inserted SD-Card. We recommend using this new configuration option for application scenarios where physical access to the device cannot be restricted effectively.
- FixedAXC F 2152cisa_csaf_ot
Follow the advice concerning SD card usage in the manual “Art.-Nr. 107708: UM EN AXC F 2152 Installing, starting up, and operating the AXC F 2152 controller um_en_axc_f_2152_107708_en_02.pdf” that can be found on the product page below:
https://www.phoenixcontact.com/online/portal/us/?uri=pxc-oc-itemdetail:pid=2404267&library=usen&pcck=P-21-14-01&tab=1&selectedCategory=ALL - MitigationAXC F 2152cisa_csaf_ot
Disable Basic128Rsa15 security policy in OPC Servers configuration. Use only Basic256 or higher.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (92)
Products and version ranges known to be affected.
advisories (6)
Vendor and ecosystem advisories describing this.
- VDE-2019-009PHOENIX CONTACT: Multiple Vulnerabilities in AXC F 21522019-06-04csaf · phoenix_contact_psirtDE
Multiple vulnerabilities have been identified in PHOENIX CONTACT AXC F 2152 with firmware versions 1.x
- WID-SEC-W-2023-1647cURL: Mehrere Schwachstellen ermöglichen Offenlegung von InformationenDeutsch2017-08-08csaf · cert_bundDE
Ein lokaler oder entfernter anonymer Angreifer kann mehrere Schwachstellen in cURL ausnutzen, um Informationen offenzulegen.
- WID-SEC-W-2025-0370Apple Mac OS: Mehrere SchwachstellenDeutsch2017-09-25csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstelle in Apple Mac OS ausnutzen, um Code mit Kernel Privilegien auszuführen, Sicherheitsvorkehrungen zu umgehen, einen Denial of Service Angriff durchzuführen oder vertrauliche Daten einzusehen.
- WID-SEC-W-2026-0180Dell Data Protection Advisor: Mehrere SchwachstellenDeutsch2026-01-20csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Dell Data Protection Advisor ausnutzen, um beliebigen Code auszuführen, einen Denial-of-Service-Zustand zu erzeugen, Sicherheitsmaßnahmen zu umgehen und nicht näher spezifizierte Angriffe zu starten.
- ICSA-19-155-01PHOENIX CONTACT PLCNext AXC F 21522019-06-04icsa · cisa_csaf_otUS
Successful exploitation of these vulnerabilities could allow an attacker to decrypt passwords, bypass authentication, and deny service to the device. In addition, these vulnerabilities could interact with third-party vulnerabilities to cause other impacts to integrity, confidentiality, and availability.
- CURL-CVE-2017-1000100TFTP sends more than buffer size2017-08-09vendor · osvUS
When doing a TFTP transfer and curl/libcurl is given a URL that contains a long filename (longer than about 515 bytes), the filename is truncated to fit within the buffer boundaries, but the buffer size is still wrongly updated to use the original 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 `sendto()` function then reads 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 has not 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`.
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (18)
External citations — patches, advisories, analysis.
- http://www.securityfocus.com/bid/100286cnnvd
- http://www.securitytracker.com/id/1039118cnnvd
- https://curl.haxx.se/docs/adv_20170809B.htmlcnnvd
- https://security.gentoo.org/glsa/201709-14cnnvd
- http://www.debian.org/security/2017/dsa-3992enisa_euvd
- http://www.securityfocus.com/bid/100286enisa_euvd
- http://www.securitytracker.com/id/1039118enisa_euvd
- https://access.redhat.com/errata/RHSA-2018:3558enisa_euvd
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