Description
driftregion iso14229 through 0.9.0 contains an integer underflow and downstream out-of-bounds read in the Handle_0x27_SecurityAccess() function in iso14229.c that allows a remote unauthenticated attacker to crash a UDS server and potentially read memory past the receive buffer by sending a single-byte 0x27 SecurityAccess request that follows any earlier well-formed 0x27 message. The handler reads the SecurityAccess subFunction from recv_buf[1] without first checking that recv_len is at least 2, then computes the key-data length as the unsigned subtraction (uint16_t)(recv_len - UDS_0X27_REQ_BASE_LEN); when recv_len equals 1 the result underflows to 65535 and is passed as args.len to the application's SecAccessValidateKey or SecAccessRequestSeed callback, which typically iterates or copies that many bytes from the 4-KB receive buffer. Every other UDS sub-function handler in the library (0x10, 0x11, 0x14, 0x19, 0x22, 0x23, 0x28, and others) performs an explicit recv_len lower-bound check before indexing; Handle_0x27_SecurityAccess is the sole outlier. The vulnerable handler reaches over CAN bus, OBD-II, ISO-TP, and DoIP transports and is exposed in the default diagnostic session without prior authentication; deployments on automotive ECUs, industrial controllers, and IoT devices that ship iso14229 as their UDS server are affected.
A remote attacker on the same diagnostic transport (CAN/OBD-II/ISO-TP/DoIP) sends one well-formed SecurityAccess request followed by a single-byte 0x27 frame; the second frame triggers the integer underflow in Handle_0x27_SecurityAccess and the application's SecAccessValidateKey or SecAccessRequestSeed callback then reads up to 65535 bytes past the 4-KB receive buffer, crashing the UDS server process or the bare-metal ECU.
Problem types
CWE-191 Integer Underflow (Wrap or Wraparound)
Product status
Any version
Credits
Burxonov Muslimbek
References
github.com/driftregion/iso14229 (driftregion/iso14229 - upstream repository)
github.com/driftregion/iso14229/blob/main/iso14229.c (Vulnerable Handle_0x27_SecurityAccess() in iso14229.c)
cwe.mitre.org/data/definitions/191.html (CWE-191: Integer Underflow (Wrap or Wraparound))
cwe.mitre.org/data/definitions/125.html (CWE-125: Out-of-bounds Read)