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Advisories

OW2 ASM 5.0 before 9.11 Excessive Memory Allocation via BootstrapMethods Attribute

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Severity
medium
Date
Affecting

  • ASM >= 5.0, < 9.11

CWE
  • CWE-789 Memory Allocation with Excessive Size Value
CVSS
6.8
CVSS V4 Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
Yu Bao, PayPal Cyber Security Team
Description
OW2 ASM 5.0 before 9.11 contains an excessive memory allocation vulnerability in ClassReader.readBootstrapMethodsAttribute() that sizes an int array from num_bootstrap_methods without validating attribute_length. Attackers can supply a crafted class file of about 100 bytes that forces roughly 2 GB allocation, causing an OutOfMemoryError that crashes the JVM or consuming thread.

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