Red Hat Security Advisory: vim security update

1. Implementation · Input Validation

   Developers should anticipate that delimiters will be injected/removed/manipulated in the input vectors of their product. Use an appropriate combination of denylists and allowlists to ensure only valid, expected and appropriate input is processed by the system.

2. Implementation · Input Validation

   Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.

3. Implementation · Output Encoding

   While it is risky to use dynamically-generated query strings, code, or commands that mix control and data together, sometimes it may be unavoidable. Properly quote arguments and escape any special characters within those arguments.

OWASP Cheat Sheets

• Abuse Case (opens in a new tab)
• Deserialization (opens in a new tab)
• Server Side Request Forgery Prevention (opens in a new tab)
• Unvalidated Redirects and Forwards (opens in a new tab)
• Cross Site Scripting Prevention (opens in a new tab)

OWASP ASVS 4.0.3

• V1.5.1 (opens in a new tab)
• V5.2.2 (opens in a new tab)

Attack patterns

• Command Delimiters (opens in a new tab)

From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

1. Architecture and Design · Refactoring

   Refactor your program so that you do not have to dynamically generate code.

2. Architecture and Design

   Run your code in a "jail" or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which code can be executed by your product.

3. Implementation · Input Validation

   Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.

OWASP Cheat Sheets

• Server Side Request Forgery Prevention (opens in a new tab)
• Unvalidated Redirects and Forwards (opens in a new tab)
• Cross Site Scripting Prevention (opens in a new tab)
• DOM based XSS Prevention (opens in a new tab)
• Abuse Case (opens in a new tab)

OWASP ASVS 4.0.3

• V5.2.8 (opens in a new tab)
• V5.2.5 (opens in a new tab)
• V1.5.1 (opens in a new tab)

Attack patterns

• Leverage Executable Code in Non-Executable Files (opens in a new tab)
• Manipulating User-Controlled Variables (opens in a new tab)
• Code Injection (opens in a new tab)

From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

1. Requirements · Language Selection

   Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.

2. Architecture and Design · Libraries or Frameworks

   Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.

3. Operation · Build and Compilation · Environment Hardening

   Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index…

OWASP Cheat Sheets

• Docker Security (opens in a new tab)
• XML Security (opens in a new tab)

OWASP ASVS 4.0.3

• V5.4.1 (opens in a new tab)
• V14.1.2 (opens in a new tab)
• V13.3.1 (opens in a new tab)

Attack patterns

• Buffer Overflow via Environment Variables (opens in a new tab)
• Overflow Buffers (opens in a new tab)
• Client-side Injection-induced Buffer Overflow (opens in a new tab)
• Filter Failure through Buffer Overflow (opens in a new tab)
• MIME Conversion (opens in a new tab)

From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

1. Requirements · Language Selection

   Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.

2. Architecture and Design · Libraries or Frameworks

   Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.

3. Operation · Build and Compilation · Environment Hardening

   Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index…

OWASP Cheat Sheets

• XML Security (opens in a new tab)
• Mass Assignment (opens in a new tab)

OWASP ASVS 4.0.3

• V13.3.1 (opens in a new tab)
• V5.1.4 (opens in a new tab)
• V5.1.3 (opens in a new tab)

From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

1. Architecture and Design

   If at all possible, use library calls rather than external processes to recreate the desired functionality.

2. Architecture and Design · Operation · Sandbox or Jail

   Run the code in a "jail" or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which files can be accessed in a particular directory or which commands can be executed by the software.

3. Architecture and Design · Attack Surface Reduction

   For any data that will be used to generate a command to be executed, keep as much of that data out of external control as possible. For example, in web applications, this may require storing the data locally in the session's state instead of sending it out to the client in a hidden form field.

OWASP Cheat Sheets

• Injection Prevention (opens in a new tab)
• Injection Prevention in Java (opens in a new tab)
• OS Command Injection Defense (opens in a new tab)
• Abuse Case (opens in a new tab)
• Deserialization (opens in a new tab)

OWASP ASVS 4.0.3

• V12.3.5 (opens in a new tab)
• V5.3.8 (opens in a new tab)
• V1.5.1 (opens in a new tab)

Attack patterns

• Command Line Execution through SQL Injection (opens in a new tab)
• Command Delimiters (opens in a new tab)
• Exploiting Multiple Input Interpretation Layers (opens in a new tab)
• Argument Injection (opens in a new tab)
• OS Command Injection (opens in a new tab)

From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

1. Architecture and Design

   If at all possible, use library calls rather than external processes to recreate the desired functionality.

2. Implementation

   If possible, ensure that all external commands called from the program are statically created.

3. Implementation · Input Validation

   Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.

OWASP Cheat Sheets

• Abuse Case (opens in a new tab)
• Deserialization (opens in a new tab)
• Injection Prevention (opens in a new tab)
• SQL Injection Prevention (opens in a new tab)
• Injection Prevention in Java (opens in a new tab)

OWASP ASVS 4.0.3

• V1.5.1 (opens in a new tab)

Attack patterns

• LDAP Injection (opens in a new tab)
• Command Delimiters (opens in a new tab)
• IMAP/SMTP Command Injection (opens in a new tab)
• Manipulating Writeable Terminal Devices (opens in a new tab)
• Exploiting Multiple Input Interpretation Layers (opens in a new tab)

From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).