CVE-2023-27477
March 08, 2023
wasmtime is a fast and secure runtime for WebAssembly. Wasmtime's code generation backend, Cranelift, has a bug on x86_64 platforms for the WebAssembly "i8x16.select" instruction which will produce the wrong results when the same operand is provided to the instruction and some of the selected indices are greater than 16. There is an off-by-one error in the calculation of the mask to the "pshufb" instruction which causes incorrect results to be returned if lanes are selected from the second vector. This codegen bug has been fixed in Wasmtiem 6.0.1, 5.0.1, and 4.0.1. Users are recommended to upgrade to these updated versions. If upgrading is not an option for you at this time, you can avoid this miscompilation by disabling the Wasm simd proposal. Additionally the bug is only present on x86_64 hosts. Other platforms such as AArch64 and s390x are not affected.
Affected Packages
wasmtime (CONAN):
Affected version(s) =5.0.0 <5.0.1Fix Suggestion:
Update to version 5.0.1wasmtime (CONAN):
Affected version(s) >=0.37.0 <4.0.1Fix Suggestion:
Update to version 4.0.1wasmtime (RUST):
Affected version(s) =5.0.0 <5.0.1Fix Suggestion:
Update to version 5.0.1wasmtime (RUST):
Affected version(s) >=1.0.0 <4.0.1Fix Suggestion:
Update to version 4.0.1cranelift-codegen (RUST):
Affected version(s) =0.92.0 <0.92.1Fix Suggestion:
Update to version 0.92.1cranelift-codegen (RUST):
Affected version(s) >=0.88.0 <0.91.1Fix Suggestion:
Update to version 0.91.1wasmtime (RUST):
Affected version(s) =6.0.0 <6.0.1Fix Suggestion:
Update to version 6.0.1cranelift-codegen (RUST):
Affected version(s) =0.93.0 <0.93.1Fix Suggestion:
Update to version 0.93.1Additional Notes
The description of this vulnerability differs from MITRE.
Related Resources (10)
Do you need more information?
Contact UsCVSS v4
Base Score:
2.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Off-by-one Error
EPSS
Base Score:
0.39
