Linux-HA Heartbeat Remote Buffer Overflow Vulnerability



Date Discovered

October 14, 2002


The Linux-HA heartbeat utility is vulnerable to a remotely exploitable buffer overflow condition. Attackers may exploit the vulnerability to execute arbitrary code. It has been reported that the condition is related to the handling of TCP packets.

Technologies Affected

  • Linux-HA heartbeat 0.4.9 .1
  • Linux-HA heartbeat 0.4.9
  • Linux-HA heartbeat 0.4.9 a
  • Linux-HA heartbeat 0.4.9 b
  • Linux-HA heartbeat 0.4.9 c
  • Linux-HA heartbeat 0.9.4 d


Block external access at the network boundary, unless external parties require service.
Access to interfaces/ports used by heartbeat should be blocked.

The vulnerability is eliminated in versions and 0.4.9e. Debian has released patches. Conectiva has released patches.


Discovered by Nathan Wallwork.

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