CVE-2017-18926

Home/CVE/raptor_xml_writer_start_element_common in raptor_xml_writer.c in Raptor RDF Syntax Library 2.0.15 miscalculates the maxi

CVE

raptor_xml_writer_start_element_common in raptor_xml_writer.c in Raptor RDF Syntax Library 2.0.15 miscalculates the maxi

raptor_xml_writer_start_element_common in raptor_xml_writer.c in Raptor RDF Syntax Library 2.0.15 miscalculates the maximum nspace declarations for the XML writer, leading to heap-based buffer overflows (sometimes seen in raptor_qname_format_as_xml).

HIGH · CVSS 7.1 EPSS 0.01771

Act now

Public exploit or PoC is available
CVSS base score ≥ 7.0

Sigma rules0 YARA rules0

Look this up elsewhere - one-click external pivots

NVD CVE.org CISA Vulners Exploit-DB GitHub PoC VulnCheck KEV GreyNoise

▸ How to read a CVE - triage first, then detect and patch

This page is every public fact about CVE-2017-18926, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.

Triage: should I act now? Four signals, and they are not interchangeable:

CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked. EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal. CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score. Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.

How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.

Then what - two workflows:

Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits. PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.

Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).

View attack path from CVE-2017-18926

◆

ATT&CK techniques

Techniques this CVE enables - linked via CWECAPECATT&CK. High◆ = named directly in ATT&CK or Nuclei templates.

T1203 · Exploitation for Client Execution T1566 · Phishing

▤ Build a SIEM detection for these techniques

⬡

Weakness Classification

CWE-787Out-of-bounds Write

▤

Affected Products & Versions

librdf raptor rdf syntax libraryall versions
debian linuxall versions
fedoraproject fedoraall versions

▤

Affected Packages

Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.

Ubuntu:16.04:LTS raptor2 fixed in 2.0.14-1ubuntu0.16.04.1

Ubuntu:18.04:LTS raptor2 fixed in 2.0.14-1ubuntu0.18.04.1

Ubuntu:20.04:LTS raptor2 fixed in 2.0.15-0ubuntu1.20.04.1

Ubuntu:22.04:LTS raptor2 fixed in 2.0.15-0ubuntu2

Ubuntu:Pro:16.04:LTS raptor

⚠

Public Exploits & PoCs

These PoC and exploit links come from public sources and are not verified to be safe or functional. Review the code before running anything, and treat unverified entries as untrusted.

pocPublic PoC (nvd-reference)

pocLive-Hack-CVE/CVE-2017-18926 (trickest)

📦

Fixed versions by distribution

The package version that resolves this CVE on each Linux distribution, from the vendor’s published security data. fixed in shows a patched version exists; open means the package is listed as affected with no fix yet.
alpine edgeraptor2 fixed in 2.0.15-r2
alpine v3.19raptor2 fixed in 2.0.15-r2
alpine v3.20raptor2 fixed in 2.0.15-r2
oracle allraptor2 open
oracle allraptor2-devel fixed in 0:2.0.15-16.el8
rhel 8raptor2 open
rhel 8raptor2-devel open
suse sle15libraptor-devel fixed in 0:2.0.15-9.3.1
suse sle15libraptor2-0 fixed in 0:2.0.15-3.3.1
suse sle15libreoffice open
suse sle15libreoffice-base open
suse sle15libreoffice-base-drivers-firebird open
suse sle15libreoffice-base-drivers-postgresql open
suse sle15libreoffice-branding-upstream open
suse sle15libreoffice-calc open
suse sle15libreoffice-calc-extensions open
suse sle15libreoffice-draw open
suse sle15libreoffice-filters-optional open
suse sle15libreoffice-gdb-pretty-printers open
suse sle15libreoffice-glade open
suse sle15libreoffice-gnome open
suse sle15libreoffice-gtk3 open
suse sle15libreoffice-icon-themes open
suse sle15libreoffice-impress open
suse sle15libreoffice-l10n-af open
suse sle15libreoffice-l10n-am open
suse sle15libreoffice-l10n-ar open
suse sle15libreoffice-l10n-as open
suse sle15libreoffice-l10n-ast open
suse sle15libreoffice-l10n-be open
suse sle15libreoffice-l10n-bg open
suse sle15libreoffice-l10n-bn open
suse sle15libreoffice-l10n-bn_IN open
suse sle15libreoffice-l10n-bo open
suse sle15libreoffice-l10n-br open
suse sle15libreoffice-l10n-brx open
suse sle15libreoffice-l10n-bs open
suse sle15libreoffice-l10n-ca open
suse sle15libreoffice-l10n-ca_valencia open
suse sle15libreoffice-l10n-ckb open
suse sle15libreoffice-l10n-cs open
suse sle15libreoffice-l10n-cy open
suse sle15libreoffice-l10n-da open
suse sle15libreoffice-l10n-de open
suse sle15libreoffice-l10n-dgo open
suse sle15libreoffice-l10n-dsb open
suse sle15libreoffice-l10n-dz open
suse sle15libreoffice-l10n-el open
suse sle15libreoffice-l10n-en open
suse sle15libreoffice-l10n-en_GB open
suse sle15libreoffice-l10n-en_ZA open
suse sle15libreoffice-l10n-eo open
suse sle15libreoffice-l10n-es open
suse sle15libreoffice-l10n-et open
suse sle15libreoffice-l10n-eu open
suse sle15libreoffice-l10n-fa open
suse sle15libreoffice-l10n-fi open
suse sle15libreoffice-l10n-fr open
suse sle15libreoffice-l10n-fur open
suse sle15libreoffice-l10n-fy open
suse sle15libreoffice-l10n-ga open
suse sle15libreoffice-l10n-gd open
suse sle15libreoffice-l10n-gl open
suse sle15libreoffice-l10n-gu open
suse sle15libreoffice-l10n-gug open
suse sle15libreoffice-l10n-he open
suse sle15libreoffice-l10n-hi open
suse sle15libreoffice-l10n-hr open
suse sle15libreoffice-l10n-hsb open
suse sle15libreoffice-l10n-hu open
suse sle15libreoffice-l10n-id open
suse sle15libreoffice-l10n-is open
suse sle15libreoffice-l10n-it open
suse sle15libreoffice-l10n-ja open
suse sle15libreoffice-l10n-ka open
suse sle15libreoffice-l10n-kab open
suse sle15libreoffice-l10n-kk open
suse sle15libreoffice-l10n-km open
suse sle15libreoffice-l10n-kmr_Latn open
suse sle15libreoffice-l10n-kn open

▣

Scoring & Timeline

7.1

HIGH · CVSS v3.1 · [email protected]

View on NVD

Attack Vector

Network Adjacent Local Physical

Attack Complexity

Low High

Privileges Required

None Low High

User Interaction

None Required

Scope

Unchanged Changed

Confidentiality

None Low High

Integrity

None Low High

Availability

None Low High

Published to NVD06 Nov 2020 · 06:15 PM

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

⚑

Vendor Advisories

usnUSN-7868-1
suse-csafopenSUSE-SU-2024:11296-1
suse-csafopenSUSE-SU-2020:1959-1
suse-csafopenSUSE-SU-2020:1949-1
suse-csafSUSE-SU-2020:3352-1
Show all 9 vendor advisoriessuse-csafSUSE-SU-2020:3350-1
suse-csafSUSE-SU-2020:3351-1
rhsaRHSA-2021:1842Low
usnUSN-4630-1

🔗

References & Sources

Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.

http://www.openwall.com/lists/oss-security/2020/11/13/1Mailing ListThird Party Advisory

http://www.openwall.com/lists/oss-security/2020/11/13/2Mailing ListThird Party Advisory

http://www.openwall.com/lists/oss-security/2020/11/14/2Mailing ListThird Party Advisory

http://www.openwall.com/lists/oss-security/2020/11/16/2Mailing ListThird Party Advisory

http://www.openwall.com/lists/oss-security/2020/11/16/3Mailing ListThird Party Advisory

https://github.com/LibreOffice/core/blob/master/external/redland/raptor/0001-Calcualte-max-nspace-declarations-correctly-for-XML-.patch.1PatchThird Party Advisory

Show all 11 references

https://lists.debian.org/debian-lts-announce/2020/11/msg00012.htmlMailing ListThird Party Advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RD67AVORGQXORPWNYYUHCH6YPPT6CI4O/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RVHFYQDMVEBICIL4DBAGRRLPUR4QYWMV/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDZRNM45VPTQF2BKRWG4YRCHJGQ2L7NS/

https://www.debian.org/security/2020/dsa-4785Third Party Advisory