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GHSA-6v25-8wq6-xq4j
com.hazelcast/hazelcastcom.hazelcast/hazelcastcom.hazelcast/hazelcastImpact
A flaw has been found in Hazelcast Enterprise Edition and Community Edition, which would allow a low-privileged malicious client to read arbitrary data in memory from any cluster member (including Java heap memory, off-heap data, and JVM process address space). Additionally, such a client may be able to cause one or more cluster members to crash, or in some Enterprise Edition configurations also corrupt memory contents, potentially leading to remote code execution. Both slim and full distributions are affected.
Patches
Enterprise customers should upgrade to a fixed version of Hazelcast Enterprise Edition:
- 5.7.0
- 5.6.1
- 5.5.10
- 5.4.5
Customers with extended support contracts should contact Hazelcast Support for information on patches for older versions.
Community Edition users should upgrade to version 5.7.0.
Hazelcast also recommends all customers follow the advice in our Security Hardening guide, including:
- Ensure Hazelcast Security is enabled and client authorization is enforced.
- Define an explicit allowlist for zero config Compact serialization.
- Avoid deploying clients on internet-facing non-secure networks or non-secure hosts.
- Ensure your Hazelcast cluster is appropriately protected by firewall rules.
- Disable any features you are not using.
Workarounds
If you cannot update to a fixed version immediately, restrict cluster access to trusted clients only and ensure clients are hardened against compromise.
References
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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