Wire vulnerabilities

Wire provides gRPC and protocol buffers for Android, Kotlin, Swift, and Java. Prior to 6.4.1 and 7.0.0-alpha04, Wire's Swift runtime ProtoReader.skipGroup(expectedEndTag:unknownFieldsWriter:) accepts a negative length for a LENGTH_DELIMITED field inside an unknown START_GROUP field. ProtoReader.readData() forwards the negative count to ReadBuffer.readData(count:), whose upper-bound-only check permits the value to reach Foundation Data(bytes:count:) and trigger an unrecoverable process trap instead of a catchable ProtoDecoder.Error. Any Swift process decoding untrusted protobuf bytes can be crashed without authentication, user interaction, or knowledge of the target schema. This issue is fixed in versions 6.4.1 and 7.0.0-alpha04.

Wire (gRPC/protobuf for Android, Kotlin, Swift, and Java) before 6.4.5 and 7.0.0-alpha04 does not consistently validate attacker-controlled lengths against the current logical message boundary. In Kotlin, decoding paths (e.g., ProtoAdapter.decode, internalNextLengthDelimited, ReadBuffer.readVarint, ProtoDecoder.decodeSizeDelimited) can cross logical boundaries, perform pointer arithmetic, or reserve excessive memory. An attacker supplying malformed protobuf bytes can cause unchecked exceptions, traps, out-of-bounds behavior, or excessive allocation, resulting in denial of service.

Vulnerability in Wire library (gRPC/protobuf) for Android, Kotlin, Swift, and Java. In versions prior to 6.3.0 and 7.0.0-alpha03, skipGroup() methods do not validate that LENGTH_DELIMITED field length is non-negative, potentially causing ArrayIndexOutOfBoundsException and crashing services decoding untrusted data.