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  1. ZABBIX BUGS AND ISSUES
  2. ZBX-26269

Improper Quotes in zabbix_sender Command Causes Memory Leak

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    • Icon: Problem report Problem report
    • Resolution: Won't fix
    • Icon: Major Major
    • None
    • 6.0.39, 7.0.11, 7.2.5, 7.4.0beta1
    • Agent2 (G)

      I encountered a critical issue when executing a zabbix_sender command. Due to improper usage of quote signs around the JSON-formatted -o parameter, the command caused a memory leak, ultimately crashing the VM.

      • Zabbix Server: 6.4.8
      • Zabbix Agent 2: 6.4.21
      • zabbix_sender: 6.4.21
      • Oracle Linux Server: 8.10

      Steps to reproduce:

      Execute:

      zabbix_sender -c /etc/zabbix/zabbix_agent2.conf -k get_log_metrics -o {"data": [...]}

      Example:

      zabbix_sender -c /etc/zabbix/zabbix_agent2.conf -k get_log_metrics -o {"data": [{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"75","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"59","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"63","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"61","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"4","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"5","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"57","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"41","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"41","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"63","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"14","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"57","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"57","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"5","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"62","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"57","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"5","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"41","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"55","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"54","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"5","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"5","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"41","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"5","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"5","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"5","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"5","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"55","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"5","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"41","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"61","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"57","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"5","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"51","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"85","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"},{"{#CHANNEL}":"masked_CHANNEL","{#RC}":"0","{#INST}":"masked_INST"}]}

       

      Result:
      VM is out of memory in less than 20sec.

      See the attached screenshots.
      Expected:

      The command should have either:

      • Properly rejected the incorrectly formatted input.
      • Handled the input gracefully without causing a memory leak.

        1. memory_leak_2.png
          memory_leak_2.png
          33 kB
        2. memory_leak_1.png
          memory_leak_1.png
          25 kB

            zabbix.dev Zabbix Development Team
            obcx Piotr
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            Watchers:
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              Created:
              Updated:
              Resolved: