BF Specification of CVE-2013-4930
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Missing verification on the range for the user-controlled 'len_field' (0, but must be at least 1) results in a wrong value, which becomes a wrong argument for the subtraction ‘-‘ operator in 'len_field-1'. The result is -1 and the sign is flipped; as 'body_len' is unsigned integer, the ‘=’ operator coerces the passed-out result to a distorted value (UINT_MAX), which when used to allocate memory on the heap leads to memory overflow. If exploited, this can lead to denial of service – assertion failure and application exit.
| vendor:product: wireshark:wireshark:1.8.0 | Bug Report | Code with Bug | Code with Fix | NVD Entry |
| Class | Definition |
| DVR | Data are verified (semantics check) or corrected (assign, remove) improperly. |
| TCM | An arithmetic expression (over numbers, strings, or pointers) is calculated improperly, or a boolean condition is evaluated improperly. |
| TCV | Data are converted or coerced into other type improperly. |
| MMN | An object is allocated, deallocated, or resized improperly. |
| Operation | Definition |
| Verify | Check data semantics (proper value/meaning) in order to accept (and possibly correct) or reject it. |
| Calculate | Find the result of a numeric, pointer, or string operation. |
| Coerce | Implicitly (forced by the Type System) convert the value of a passed in/out argument or the return into the corresponding parameter or return data type. (Type Coercion is known also as Type Juggling. |
| Allocate | Reserve space in memory for an object; defines its initial boundaries and size. |
| Cause/Consequence | Definition |
| Code Defect Bug | The operation has a bug, which is the first cause for the chain of weaknesses underlying a software security vulnerability. The bug must be fixed to resolve the vulnerability. |
| Missing Code | The entire operation implementation or a part of its specification is absent. |
| Data Error/Fault | The object data has harmed semantics or inconsistent or wrong value |
| Wrong Value | Data value is not accurate value (e.g., outside of a range). |
| Wrong Argument | Inaccurate input data value, i.e., non-verified for harmed semantics. |
| Flipped Sign | Sign bit is overwritten from type related calculation. |
| Distorted Value | Incorrect value (although fits type size) due to sign flip or signed/unsigned and vice versa conversions. |
| Wrong Size | The value used as size does not match the actual size of the object. |
| Memory Corruption/Disclosure Final Error | An exploitable or undefined system behavior caused by memory addressing, allocation, use, and deallocation bugs. |
| Memory Overflow | More memory is requested than available. |
| Operation Attribute | Definition |
| Mechanism | Shows how the buggy/faulty operation code is performed. |
| Range | Checking data are within a (min, max) interval. |
| Operator | A function with a symbolic name that implements a mathematical, relational or logical operation. |
| Pass Out | Supplying "out" or "in/out" arguments' data values or a return value to a function/ operator. |
| Explicit | The operation is performed by a function/method call. |
| Source Code | Shows where the buggy/faulty operation code is in the program -- in what kind of software. |
| Codebase | The operation is in the programmer's code - in the application itself. |
| Execution Space | Shows where the buggy/faulty operation code is running or with what privilege level). |
| Local | The bugged code runs in an environment with access control policy with limited (local user) permission. |
| Userland | 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 | Shows where the data come from. |
| Stored | The data are from a permanent storage (e.g., file, database on a storage device). |
| Name State | Shows at what stage the entity name is. |
| Bound | The name is linked to a declared (or inferred) data type, a defined object's data, or a called function implementation. |
| Data Kind | Shows what the data value is. |
| Numeric | A number -- a sequence of digits. |
| Type Kind | Shows what the data type composition is. |
| Primitive | A scalar data type that mimics the hardware units - e.g., int (long, short, signed), float, double, string, Boolean. A primitive data type is only language defined and is not built from other data types. |
| Address State | Shows where the address is in the memory layout. |
| Heap | The object is a dynamically allocated data structure (e.g., via malloc() and new). |