ZABBIX BUGS AND ISSUES
  1. ZABBIX BUGS AND ISSUES
  2. ZBX-3794

zabbix_agentd DoS attack with vfs.file.cksum

        Details

        • Type: Incident report Incident report
        • Status: Closed
        • Priority: Major Major
        • Resolution: Fixed
        • Affects Version/s: None
        • Fix Version/s: 1.8.6, 1.9.4 (alpha)
        • Component/s: Agent (G)
        • Labels:
          None
        • Environment:
          *NIX

          Description

          If you feed a checksum generator a special device i. e. /dev/urandom the CPU load jumps to 100 %. Steps to reproduce on *NIX:

          • start zabbix_agentd
          • run: echo "vfs.file.cksum[/dev/urandom]" | nc 127.0.0.1 10050
          • observe cpu load with command: top

            Activity

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            dimir added a comment -

            Reproducible in both 1.8pre and 1.9 versions.

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            dimir added a comment - Reproducible in both 1.8pre and 1.9 versions.
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            dimir added a comment -

            RESOLVED in development branch svn://svn.zabbix.com/branches/dev/ZBX-3794

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            dimir added a comment - RESOLVED in development branch svn://svn.zabbix.com/branches/dev/ZBX-3794
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            dimir added a comment -

            Fixed in branches/1.8 (r19561), trunk (r19633).

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            dimir added a comment - Fixed in branches/1.8 (r19561), trunk (r19633).
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            richlv added a comment -

            seems to have caused ZBX-3830

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            richlv added a comment - seems to have caused ZBX-3830
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            Takanori Suzuki added a comment -

            Though Zabbix SIA might already stopped to maintain 1.6.x, because this is security issue I checked this issue in Zabbix-1.6.9.
            Zabbix-1.6-9 is also affected.
            So, I made a patch for Zabbix-1.6.9.

            https://gist.github.com/1332797

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            Takanori Suzuki added a comment - Though Zabbix SIA might already stopped to maintain 1.6.x, because this is security issue I checked this issue in Zabbix-1.6.9. Zabbix-1.6-9 is also affected. So, I made a patch for Zabbix-1.6.9. https://gist.github.com/1332797
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            dimir added a comment -

            Thanks!

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            dimir added a comment - Thanks!

              People

              • Assignee:
                dimir
                Reporter:
                dimir
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                Dates

                • Created:
                  Updated:
                  Resolved: