Walrus
Monthly
Out-of-bounds write in Samsung's open-source Walrus WebAssembly runtime allows a crafted WASM component to corrupt process heap memory via a WASI 0.2 stream-read implementation flaw. The root cause is a `memcpy` in `WASI02Impl.cpp` that copies the requested read length (`size`) rather than the actual bytes read (`read`) from the buffer, writing beyond valid buffer bounds when a partial or short read occurs. A secondary defective bounds check for type-index validation in the WASM component parser compounds the attack surface. A proof-of-concept WASM file (`stream-read-oob-poc.wast`) was committed as part of the fix in PR #482, confirming exploitability; no public exploit independent of the fix has been identified at time of analysis.
NULL pointer dereference in Samsung's open-source Walrus WebAssembly runtime crashes the parser when processing malformed WASM binaries, resulting in denial of service. The vulnerability exists in the WASMBinaryReader component (WASMParser.cpp) at commit f339b8ee4ea701772e8ae640b3d1b12ac02b1ae9, where multiple error-handling code paths fail to return early, allowing execution to continue past invalid state and dereference null pointers. No public exploit code has been identified at time of analysis, and this vulnerability is not listed in the CISA KEV catalog.
NULL pointer dereference in Samsung Open Source Walrus's WebAssembly binary parser causes application-level denial of service when a crafted .wasm module containing deeply nested instructions is loaded. The vulnerability affects the Walrus runtime at commit f339b8ee4ea701772e8ae640b3d1b12ac02b1ae9 (CPE: cpe:2.3:a:samsung_open_source:walrus) and is classified CVSS 5.5 Medium with a local attack vector requiring user interaction. No public exploit code has been identified and the vulnerability is not listed in the CISA KEV catalog; an upstream fix is available in GitHub PR #409 but a tagged release version has not been independently confirmed.
Integer overflow in Samsung Walrus WebAssembly runtime's Memory::init() source-bounds check allows an attacker who supplies a crafted WebAssembly module to trigger a 32-bit unsigned wrap-around that bypasses source-bounds validation, causing an out-of-bounds heap read and process crash (denial of service). The affected product is Samsung Walrus at commit ff3bf5ff5c4878f8e5572c9593d303f6bc997443 across all platforms. Publicly available exploit code exists in the form of a proof-of-concept .wast module (stream-read-oob-poc.wast) included in the upstream fix PR #482.
Out-of-bounds write in Samsung's open-source Walrus WebAssembly runtime allows a crafted WASM component to corrupt process heap memory via a WASI 0.2 stream-read implementation flaw. The root cause is a `memcpy` in `WASI02Impl.cpp` that copies the requested read length (`size`) rather than the actual bytes read (`read`) from the buffer, writing beyond valid buffer bounds when a partial or short read occurs. A secondary defective bounds check for type-index validation in the WASM component parser compounds the attack surface. A proof-of-concept WASM file (`stream-read-oob-poc.wast`) was committed as part of the fix in PR #482, confirming exploitability; no public exploit independent of the fix has been identified at time of analysis.
NULL pointer dereference in Samsung's open-source Walrus WebAssembly runtime crashes the parser when processing malformed WASM binaries, resulting in denial of service. The vulnerability exists in the WASMBinaryReader component (WASMParser.cpp) at commit f339b8ee4ea701772e8ae640b3d1b12ac02b1ae9, where multiple error-handling code paths fail to return early, allowing execution to continue past invalid state and dereference null pointers. No public exploit code has been identified at time of analysis, and this vulnerability is not listed in the CISA KEV catalog.
NULL pointer dereference in Samsung Open Source Walrus's WebAssembly binary parser causes application-level denial of service when a crafted .wasm module containing deeply nested instructions is loaded. The vulnerability affects the Walrus runtime at commit f339b8ee4ea701772e8ae640b3d1b12ac02b1ae9 (CPE: cpe:2.3:a:samsung_open_source:walrus) and is classified CVSS 5.5 Medium with a local attack vector requiring user interaction. No public exploit code has been identified and the vulnerability is not listed in the CISA KEV catalog; an upstream fix is available in GitHub PR #409 but a tagged release version has not been independently confirmed.
Integer overflow in Samsung Walrus WebAssembly runtime's Memory::init() source-bounds check allows an attacker who supplies a crafted WebAssembly module to trigger a 32-bit unsigned wrap-around that bypasses source-bounds validation, causing an out-of-bounds heap read and process crash (denial of service). The affected product is Samsung Walrus at commit ff3bf5ff5c4878f8e5572c9593d303f6bc997443 across all platforms. Publicly available exploit code exists in the form of a proof-of-concept .wast module (stream-read-oob-poc.wast) included in the upstream fix PR #482.