BF Specification of CVE-2019-14814 — Heap Overflow in Marvell wifi diver in Linux kernel up to excluding v5.3
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Missing verification of 'rate_ie->len' towards a upper limit leads to use of an inconsistent size for an object, allowing a pointer reposition over its bounds, which, when used in 'memcpy()' leads to a heap buffer overflow. If exploited, this can lead to denial of service – system crash; and possibly arbitrary code execution.
Missing Code (in 'mwifiex_set_uap_rates()') to Verify (length) of In Use data using Range mechanism (rate_ie->len > MWIFIEX_SUPPORTED_RATES) in Codebase source code (drivers/net/wireless/marvell/mwifiex/uap_cmd.c#L268) in Admin execution space (Linux kernel of Wifi Driver) leads to Inconsistent Value ('rate_ie->len') error, which propagates to
Wrong Size (in 'memcpy(..., rate_ie + 1, rate_ie->len)') to Reposition (pointer) on Heap with Used size using Sequential mechanism in Codebase source code (drivers/net/wireless/marvell/mwifiex/uap_cmd.c#L276) in Kernel execution space (Linux kernel of Wifi Driver) that results in Overbound Pointer ('rate_ie + 1') error, which propagates to
Overbound Pointer (in 'ptr->offsets[entries] = gf_bs_read_u64(bs);') to Write (object) Huge address span on Heap with Used size using Sequential mechanism in Third-Party source code (src/isomedia/box_code_base.c#L58) in Userland execution space that results in Buffer Overflow final error, which can be exploited toward
Arbitrary Code Execution (ACE) (everything could be lost),Denial of Service (DOS) (availability loss) security failure.
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| Class | Definition |
| DVR | Data Verification (DVR) class – Data are verified (i.e., semantics check) or corrected (i.e., assign or remove) improperly. |
| MAD | Memory Addressing (MAD) class – The pointer to an object is initialized, dereferenced, repositioned, or reassigned to an improper memory address. |
| MUS | Memory Use (MUS) class – An object is initialized, read, written, or cleared improperly. |
| Operation | Definition |
| Verify | Verify operation – Check data semantics (e.g., proper value/meaning) in order to accept (and possibly correct) or reject it. |
| Reposition | Reposition operation – Change the pointer to another position inside its object. |
| Write | Write operation – Change the data value of an object in memory to another meaningful value. |
| Cause/Consequence | Definition |
| Code Bug | Code Bug type – An error in the implementation of an operation – proper operands over an improper operation. It is the roor cause of a security vulnerability. Must be fixed to resolve the vulnerability. |
| Missing Code | Missing Code bug - The operation is misplaced entirely absent. |
| Data Error/Fault | Data error (or fault) type – The data of an object has harmed semantics or inconsistent or wrong value. |
| Inconsistent Value | Inconsistent Value error (or fault) – The data value does not correspond to related data value (e.g., inconstancy between the value of a size variable and the actual buffer size). |
| Wrong Size | Wrong Size error (or fault) – The value used as size or length (i.e., the number of elements) does not match the object's memory size or length (e.g., to limit a pointer reposition or index increment/decrement in a repetition statement). |
| Address Error/Fault | Address error (or fault) type – The address of an object is wrong. |
| Overbound Pointer | Overbound Pointer error (or fault) – Holds an address that is above the upper boundary of its object. |
| Memory Corruption/Disclosure Final Error | Memory Corruption/Disclosure final error/exploit vector type – An exploitable or undefined system behavior caused by memory addressing, allocation, use, or deallocation bugs. |
| Buffer Overflow | Buffer Overflow final error – Write data above the upper bound of an object (i.e., buffer over-write). |
| Operation Attribute | Definition |
| Mechanism | Mechanism operation attribute type – Shows how the operation with a bug or faulty operand is performed. |
| Range | Range operation attribute – The operation checks data are within a (min, max) interval. |
| Sequential | Sequential operation attribute – The operation is via iterating over the object elements. |
| Source Code | Source Code operation attribute type – Shows where the code of the operation with a bug or faulty operand resides within the software, firmware, or hardware. |
| Codebase | Codebase operation attribute – The operation is in the programmer's code - in the application itself. |
| Third-Party | Third-Party operation attribute – The operation code is in a third-party source. |
| Execution Space | Execution Space operation attribute type – Shows where the operation with a bug or faulty operand is executed and the privilege level at which it runs. |
| Admin | Admin operation attribute – The bugged code runs in an environment with access control policy with unlimited (admin user) permission. |
| Kernel | Kernel operation attribute – The bugged code runs in an environment with privilege levels with access privileged instructions (e.g., ring 0 in x86 architecture). |
| Userland | Userland operation attribute – The bugged code runs in an environment with privilege levels, but in unprivileged mode (e.g., ring 3 in x86 architecture). |
| Operand Attribute | Definition |
| Data State | Data State operand attribute type – Shows where the data comes from. |
| In Use | In Use operand attribute – Data are from a volatile storage (e.g., RAM, cache memory). |
| Address State | Address State operand attribute type – Shows where the address is (i.e., its location) in the memory layout. |
| Heap | The object is a dynamically allocated data structure (e.g., via malloc() or new). |
| Size Kind | Size Kind operand attribute type – Shows what is used as the size or length (i.e., the number of elements) of an object - e.g., as the limit for traversal over the elements. |
| Used | Used operand attribute – A supplied value to be used as the size or length (i.e., the number of elements) of an object. |
| Address Kind | Address Kind operand attribute type - Shows how much memory is accessed (i.e., the span) outside of a bound of an object. |
| Huge | More than 1KB of memory is accessed. |
| Failure | Definition |
| ACE | Arbitrary Code Execution (ACE) – Execution of unauthorized commands or code execution that could lead to everything being lost; remote code execution (RCE) is a sub-case of ACE on a target system or device from a remote location, typically over a network. |
| DOS | Denial of Service (DOS) – Disruption of access to or use of information or information systems that leads to availability loss. |