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Advisories

Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache

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Severity
low
Date
Affecting

  • objenesis >= 0, < 3.6

CWE
  • CWE-386 Symbolic Name not Mapping to Correct Object
CVSS
2.0
CVSS V4 Vector
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Credit
Yu Bao, PayPal Cyber Security Team
Description
Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader to substitute objects into another by exploiting instantiator caching keyed on class name. When a shared ObjenesisStd instance caches instantiators by clazz.getName() in ObjenesisBase.getInstantiatorOf(), same-named classes collide, causing newInstance() to return wrong-class objects and ClassCastException failures.

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