Wasmtime vulnerable to data leakage between instances in the pooling allocator
CVE-2022-39393

8.6HIGH

Key Information:

Vendor

Bytecodealliance

Status
Wasmtime
Vendor
CVE Published:
10 November 2022

What is CVE-2022-39393?

Wasmtime is a standalone runtime for WebAssembly. Prior to versions 2.0.2 and 1.0.2, there is a bug in Wasmtime's implementation of its pooling instance allocator where when a linear memory is reused for another instance the initial heap snapshot of the prior instance can be visible, erroneously to the next instance. This bug has been patched and users should upgrade to Wasmtime 2.0.2 and 1.0.2. Other mitigations include disabling the pooling allocator and disabling the memory-init-cow.

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Affected Version(s)

wasmtime >= 2.0.0, < 2.0.2 < 2.0.0, 2.0.2

wasmtime < 1.0.2 < 1.0.2

References

https://github.com/bytecodealliance/wasmtime/security/adv...
x_refsource_CONFIRM
https://github.com/bytecodealliance/wasmtime/commit/2614f...
x_refsource_MISC

CVSS V3.1

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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