CWE-1324: Sensitive Information Accessible by Physical Probing of JTAG Interface
Weakness ID: 1324
Abstraction: Base Structure: Simple
Status: Draft
Presentation Filter:
Description
Sensitive information in clear text on the JTAG interface may be examined by an eavesdropper, e.g. by placing a probe device on the interface such as a logic analyzer, or a corresponding software technique.
Extended Description
On a debug configuration with a remote host, unbeknownst to the host/user, an attacker with physical access to a target system places a probing device on the debug interface or software related to the JTAG port e.g. device driver. While the authorized host/user performs sensitive operations to the target system, the attacker uses the probe to collect the JTAG traffic.
Relationships
The table(s) below shows the weaknesses and high level categories that are related to this weakness. These relationships are defined as ChildOf, ParentOf, MemberOf and give insight to similar items that may exist at higher and lower levels of abstraction. In addition, relationships such as PeerOf and CanAlsoBe are defined to show similar weaknesses that the user may want to explore.
Relevant to the view "Research Concepts" (CWE-1000)
Nature
Type
ID
Name
ChildOf
Class - a weakness that is described in a very abstract fashion, typically independent of any specific language or technology. More specific than a Pillar Weakness, but more general than a Base Weakness. Class level weaknesses typically describe issues in terms of 1 or 2 of the following dimensions: behavior, property, and resource.
The different Modes of Introduction provide information about how and when this weakness may be introduced. The Phase identifies a point in the life cycle at which introduction may occur, while the Note provides a typical scenario related to introduction during the given phase.
Phase
Note
Architecture and Design
May be introduced when design does not plan for an attacker having physical access while legitimate user is remotely operating device
Implementation
Applicable Platforms
The listings below show possible areas for which the given weakness could appear. These may be for specific named Languages, Operating Systems, Architectures, Paradigms, Technologies, or a class of such platforms. The platform is listed along with how frequently the given weakness appears for that instance.
The table below specifies different individual consequences associated with the weakness. The Scope identifies the application security area that is violated, while the Impact describes the negative technical impact that arises if an adversary succeeds in exploiting this weakness. The Likelihood provides information about how likely the specific consequence is expected to be seen relative to the other consequences in the list. For example, there may be high likelihood that a weakness will be exploited to achieve a certain impact, but a low likelihood that it will be exploited to achieve a different impact.
Scope
Impact
Likelihood
Confidentiality
Technical Impact: Read Memory; Read Files or Directories; Read Application Data
High
Demonstrative Examples
Example 1
A TAP accessible register is read/written by a JTAG
based tool, for internal tool use for an authorized
user. The JTAG based tool does not provide access to
this data to an unauthorized user of the tool.
However, the user can connect a probing device and
collect the values directly from the JTAG interface, if
no additional protections are employed.
Potential Mitigations
Phase: Manufacturing
Disable permanently the JTAG interface before releasing the system to untrusted users.
Effectiveness: High
Phase: Architecture and Design
Encrypt all information (traffic) on the JTAG interface using an approved algorithm (such as NIST). Encrypt path from inside chip to trusted user application
Description
