BF Specification of CVE-2014-0160 Heartbleed in OpenSSL v1.0.1 before v1.0.1g

Missing verification of 'payload' length 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 over-read. If exploited, this can lead to exposure of sensitive information – confidentiality loss.

vendor:product: openssl:openssl:*

Bug Report

Code with Bug

Code with Fix

NVD Entry

DVRData Verification (DVR) class – Data are verified (semantics check) or corrected (assign, remove) improperly.
MADMemory Addressing (MAD) class – The pointer to an object is initialized, dereferenced, repositioned, or reassigned to an improper memory address.
MUSMemory Use (MUS) class – An object is initialized, read, written, or cleared improperly.
VerifyVerify operation – Check data semantics (e.g., proper value/meaning) in order to accept (and possibly correct) or reject it.
RepositionReposition operation – Change the pointer to another position inside its object.
ReadRead operation – Retrieve the data value of an object from memory.
Code BugCode Bug type – Defect in the implementation of the operation – proper operands over an improper operation. A first cause for the chain of weaknesses underlying a software security vulnerability. Must be fixed to resolve the vulnerability.
   Missing CodeMissing Code bug - The operation is entirely absent.
Data Error/FaultData Fault/Error type – The object data has harmed semantics or inconsistent or wrong value.
   Inconsistent ValueInconsistent Value fault/error – 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 SizeWrong Size fault/error – The value used as size does not match the actual size of the object memory (e.g., to restrict pointer reposition or index increment/decrement in a repetition statement).
Address Error/FaultAddress Fault/Error type – The object address in use is wrong.
   Over Bounds PointerOver Bounds Pointer fault/error – Holds an address above the upper boundary of its object.
Memory Corruption/Disclosure Final ErrorMemory Corruption/Disclosure final error type – An exploitable or undefined system behavior caused by memory addressing, allocation, use, and deallocation bugs.
   Buffer Over-ReadBuffer Over-Read final error – Read data above the upper bound of an object.
Operation AttributeDefinition
MechanismMechanism operation attribute type – Shows how the operation is performed.
   RangeRange operation attribute – The operation checks data are within a (min, max) interval.
   SequentialSequential operation attribute – The operation is via iterating over the object elements.
Source CodeSource Code operation attribute type – Shows where the operation code resides within the software, firmware, or circuit logic code.
   Third-PartyThird-Party operation attribute – The operation code is in a third-party software.
Execution SpaceExecution Space operation attribute type – Shows where the operation is executed or the privilege level at which it runs.
   LocalLocal operation attribute – The bugged code runs in an environment with access control policy with limited (local user) permission.
   UserlandUserland operation attribute – The bugged code runs in an environment with privilege levels, but in unprivileged mode (e.g., ring 3 in x86 architecture).
Operand AttributeDefinition
Data StateData State operand attribute type – Shows where the data came from.
   TransferredTransferred operand attribute – Data are from another device via a network (e.g., connecting analog device or another computer).
Address StateAddress State operand attribute type - Shows where the address is in the memory layout.
   HeapHeap operand attribute – The object is a dynamically allocated data structure (e.g., via malloc() and new).
Size KindSize Kind operand attribute type – Shows the object's limit for traversal.
   UsedUsed operand attribute – A supplied size of an object.