ZABBIX BUGS AND ISSUES

zabbix_agentd DoS attack with vfs.file.cksum

Details

  • Type: Bug Bug
  • Status: Closed 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
  • Zabbix ID:
    NA

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

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
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dimir added a comment -

Thanks!

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dimir added a comment - Thanks!

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Dates

  • Created:
    Updated:
    Resolved: