BF Specification of CVE-2007-1320 — BitBlt Heap Buffer Overflow
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Missing Code (in cirrus_invalidate_region() and others) to Correct (upper bound via applying & s->cirrus_addr_mask) of In Use data using Quantity mechanism in Codebase source code (hw/cirrus_vga.c#L642 hw/cirrus_vga.c#L657 hw/cirrus_vga.c#L674 hw/cirrus_vga.c#L693-#L694 hw/cirrus_vga.c#L744-#L745 w/cirrus_vga.c#L771-#L772 hw/cirrus_vga.c#L804-#L805 hw/cirrus_vga.c#L1923 hw/cirrus_vga.c#L1946) in Bare-Metal execution space (Xen bare-metal hypervisor) leads to Wrong Value (off_cur_end) error, which propagates to
Wrong Size (in 'while (off_cur < off_cur_end)') to Reposition (pointer) on Heap with Used size using Direct mechanism in Codebase source code (hw/cirrus_vga.c#L664) in Bare-Metal execution space (Xen bare-metal hypervisor) that results in Overbound Pointer (s->vram_offset + off_cur) error, which propagates to
Overbound Pointer (in 'cpu_physical_memory_set_dirty(s->vram_offset + off_cur)') to Write using Sequential mechanism in Codebase source code (hw/cirrus_vga.c#L645) in Bare-Metal execution space (Xen bare-metal hypervisor) that results in Buffer Overflow (heap) 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 |
| Correct | Correct operation – Modify data (e.g., assign new value or remove) to make it accurate. |
| 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. |
| Wrong Value | Wrong Value error (or fault) – The data value is not accurate (e.g., outside of a range). |
| 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. |
| Quantity | Quantity operation attribute – The operation checks data for a specific measurable value (e.g., size, time, rate, frequency). |
| Direct | Direct operation attribute – The operation is on a particular object element. |
| 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. |
| 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. |
| Bare-Metal | Bare-Metal operation attribute – The bugged code runs in an environment without privilege control. Usually, the program is the only software running and has total access to the hardware. |
| 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. |
| 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. |