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

zabbix_agentd DoS attack with vfs.file.cksum

    Details

    • Type: Bug Bug
    • 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

        Hide
        dimir added a comment -

        Reproducible in both 1.8pre and 1.9 versions.

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

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

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

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

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

        seems to have caused ZBX-3830

        Show
        richlv added a comment - seems to have caused ZBX-3830
        Hide
        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

        Show
        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
        Hide
        dimir added a comment -

        Thanks!

        Show
        dimir added a comment - Thanks!

          People

          • Assignee:
            dimir
            Reporter:
            dimir
          • Votes:
            0 Vote for this issue
            Watchers:
            0 Start watching this issue

            Dates

            • Created:
              Updated:
              Resolved: