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Debian LinuxOperating system · Debian

CVE-2019-13273

CRITICAL · 9.8 CVSS v3.0 Published 2019-08-27
Fix available
A fix is available. Upgrade to after 4.3.28 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In Xymon through 4.3.28, a buffer overflow vulnerability exists in the csvinfo CGI script. The overflow may be exploited by sending a crafted GET request that triggers an sprintf of the srcdb parameter.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A buffer overflow vulnerability exists in the csvinfo CGI script of Xymon through version 4.3.28. The vulnerability is triggered via a crafted GET request containing a specially crafted srcdb parameter that causes an unbounded sprintf() call, allowing potential remote code execution.

MitigationUpgrade Xymon to a version beyond 4.3.28 that contains the security patch. If immediate patching is not possible, disable or restrict access to the csvinfo CGI script via web server configuration.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Debian LinuxOperating system
Affected:= 8.0
XymonApplication
Affected:<= 4.3.28

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Verify Xymon installation exists
    Run 'dpkg -l | grep xymon' on Debian/Ubuntu, or 'rpm -qa | grep xymon' on RHEL/CentOS, or check for /usr/lib/xymon or /opt/xymon directories
    Affected if Xymon is installed on the system
  2. Determine installed Xymon version
    Run 'xymon --version' or check the version file typically found in /usr/lib/xymon/server/bin/xymon, or 'dpkg -l xymon' on Debian systems
    Affected if The version number is 4.3.28 or lower
  3. Locate the csvinfo CGI script
    Find the CGI directory - typically /usr/lib/xymon/cgi-bin/ or /opt/xymon/cgi-bin/ - and confirm csvinfo or csvinfo.cgi exists in that location
    Affected if The csvinfo CGI script is present on the system
  4. Confirm csvinfo is web-accessible
    Check your web server configuration (Apache httpd.conf, nginx config, or similar) for CGI script alias or script alias directive pointing to the Xymon cgi-bin directory containing csvinfo
    Affected if The csvinfo CGI script is accessible via HTTP/HTTPS from the web server
  5. Check web server access controls
    Review the web server configuration for any Allow/Deny directives or authentication requirements applied to the csvinfo script or its directory
    Affected if There are no restrictions on who can access the csvinfo CGI script (it is world-exposed)

If Xymon version 4.3.28 or lower is installed AND the csvinfo CGI script is present AND web-accessible without restrictions, the system is vulnerable to CVE-2019-13273.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to a release after 4.3.28
Interim mitigation

Upgrade Xymon to a version beyond 4.3.28 that contains the security patch. If immediate patching is not possible, disable or restrict access to the csvinfo CGI script via web server configuration.

Recommended fix Moderate confidence

Xymon 4.3.29 or later

  1. 1. Identify the current Xymon version installed by checking the installed package or running 'xmversion'
  2. 2. For Debian 8.0 (Jessie), check if Debian LTS security updates are available: 'apt-get update && apt-get install -y libpam-modules LTS'
  3. 3. Upgrade Xymon to version 4.3.29 or later, which contains the fix for the csvinfo buffer overflow
  4. 4. If using package management: 'apt-get update && apt-get install --only-upgrade xymon' or download from xymon.com
  5. 5. After upgrade, restart the Xymon server: 'service xymon restart'
  6. 6. Verify the upgrade by checking 'xmversion' output shows version 4.3.29 or higher
  7. 7. Test the csvinfo CGI script with a normal request to confirm functionality
Caveat Minor: Review any custom configurations in xymonclient.cfg or custom scripts that may reference the csvinfo functionality

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Debian Linux Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing6.0 h
  • Review / QA3.0 h
19.0 hours of engineering $3,320
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2019-13273 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data