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Deserialization of Untrusted Data in log4j:log4j

CVE-2019-17571

  • log4j:log4j
  • org.apache.logging.log4j:log4j-core
High
9.8/10

Summary

Included in Log4j 1.2 is a SocketServer class that is vulnerable to deserialization of untrusted data which can be exploited to remotely execute arbitrary code when combined with a deserialization gadget when listening to untrusted network traffic for log data. This affects Log4j 1.2 up to 1.2.17. NOTE: log4j:log4j 1.2 is end-of-life since 2015 and will not be fixed. To mitigate this, users are advised to migrate to org.apache.logging.log4j:log4j-core 2.8.2 or above.

  • LOW
  • NETWORK
  • HIGH
  • UNCHANGED
  • NONE
  • NONE
  • HIGH
  • HIGH

CWE-502 - Deserialization of Untrusted Data

Deserialization of untrusted data vulnerabilities enable an attacker to replace or manipulate a serialized object, replacing it with malicious data. When the object is deserialized at the victim's end the malicious data is able to compromise the victim’s system. The exploit can be devastating, its impact may range from privilege escalation, broken access control, or denial of service attacks to allowing unauthorized access to the application's internal code and logic which can compromise the entire system.

References

Advisory Timeline

  • Published