BF Specification of CVE-2007-6429 Integer overflows in X.Org Xserver before 1.4.1
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Missing verifications of input values leads to use of a wrong argument in a memory size calculations and wraparounds , allowing allocation of not enough memory, which, when used leads to a buffer overflow. If exploited, this can lead to arbitrary code execution.
//generated// Missing Code to Verify via in leads to Wrong Value , which propagates to Wrong Argument Calculate in that results in Wrap Around (integer overflow) , which propagates to Wrong Size (in ‘xalloc()’ and ‘AshmFuncs()’) Allocate in that results in Insufficient Size , which propagates to Insufficient Size Write in that results in Buffer Overflow , which can be exploited toward Arbitrary Code Execution (ACE) (everything could be lost) security failure.
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| Class | Definition |
| Operation | Definition |
| 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 Argument | Wrong Argument error (or fault) – Inaccurate input data value, i.e., non-verified for harmed semantics. |
| Wrap Around | Wrap Around error (or fault) – A moved around-the-clock value over its data type upper or lower range, as it exceeds that range. (Integer Over-/Under-flow is a wrapped-around the upper/lower range integer value; may become very small/large and change to the opposite sign.) |
| 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). |
| Size Error/Fault | Type error (or fault) type – The set or range of allowed values of an entity is wrong or the operations allowed on them are wrong. |
| Insufficient Size | Insufficient Size error (or fault) – The allocated memory is too little for the data it should store. |
| 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 |
| Operand Attribute | Definition |