Medium severity · published Mar 8, 2023
CVE-2023-27477
wasmtime is a fast and secure runtime for WebAssembly
4.3
CVSS
0.6%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CR
Cranelift-codegen · Bytecodealliance
0.84.0 before 0.91.1; 0.92.0; 0.93.0 · source: NVD
WA
Wasmtime · Bytecodealliance
0.37.0 before 4.0.1; 5.0.0; 6.0.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-27477
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-27477
Product
https://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.wasm_simd
Patch
https://github.com/bytecodealliance/wasmtime/commit/5dc2bbccbb363e474d2c9a1b8e38a89a43bbd5d1
Mitigation
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xm67-587q-r2vw
Not Applicable
https://github.com/webassembly/simd
Mailing List
https://groups.google.com/a/bytecodealliance.org/g/sec-announce/c/Mov-ItrNJsQ
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