Linode Safety Digest October 16-23, 2022


On this week’s digest, we’ll focus on:

  • Linode Terraform (TF) Supplier Deterministic Password Creation
  • Apache Commons Textual content Distant Code Execution (RCE)
  • Vm2 sandbox escape to RCE

Linode Terraform Supplier Creates a Non-seeded deterministic Password 

A safety vulnerability was found within the Linode Terraform Supplier, a plugin designed for automating provisioning Linode cases utilizing Terraform. Terraform is an IaC software that focuses on creating, modifying, and destroying servers as a substitute of managing the software program on these servers. 

The vulnerability impacts Linodes created with the Terraform plugin model v1.29.3. Within the Terraform supplier, when a Linode is created with out offering a root password, the TF supplier makes use of a randomly generated password. The affected plugin model appears to generate deterministic passwords as a result of a change in our password era performance. The weak part concerned the utilization of the maths/rand Go bundle as a substitute of the crypto/rand for random password manufacturing. Moreover, the maths/rand bundle was not being seeded. 

To guard your future deployments, please improve the Linode Terraform Supplier software to the most recent model, presently v1.29.4. If you’re not capable of improve instantly, you too can change the foundation password on the cases deployed by means of the affected plugin.

For those who want additional help, or if in case you have any questions, please attain out to

Apache Commons Textual content Distant Code Execution (RCE)

Apache Commons Textual content performs variable interpolation, permitting properties to be dynamically evaluated and expanded. The usual format for interpolation is “${prefix:identify}”, the place “prefix” is used to find an occasion of org.apache.commons.textual content.lookup.StringLookup that performs the interpolation.

CVE-2022-42889 is an distant code execution that exists in Apache Commons Textual content model 1.5 by means of 1.9 the place the set of default Lookup cases (from the StringSubstitutor class) included interpolators that would lead to arbitrary code execution or contact with distant servers. The weak lookups are:

  • “script” – Executes expressions utilizing the JVM script execution engine (javax.script)
  • “dns” – Resolves DNS information 
  • “url” – Load values from URLs

Moreover, any distant server functions utilizing interpolation defaults within the affected variations could be weak to distant code execution or unintentional contact with distant servers if untrusted configuration values are used. 

The way in which to find out if in case you have this library put in is to run `discover / -type f -name ‘commons-text*.jar’`, which is able to give us any .jar file with the prefix of commons-text. 

The repair is on the market beginning with Apache Commons Textual content 1.10.0. The repair disables the dns, url, and script lookup interpolators by default. Different workarounds may also be utilized, which embody sanitizing enter in locations the place you settle for and course of untrusted information. 

Vm2 sandbox escape to RCE

vm2 is a widely-used npm bundle that acts as a sandbox the place you’ll be able to run untrusted code with allowlisted Node’s built-in modules. This bundle could be very widespread with over 16 million downloads a month, making it a worthy vulnerability to leverage in opposition to an utility with the vm2 bundle put in. 

CVE-2022-36067 is a distant code execution that exists within the vm2 sandbox library the place a person might escape the sandbox of vm2 and get entry to the host operating the sandbox. The vulnerability presently impacts variations 3.9.10 and beneath. 

This vulnerability entails utilizing the prepareStackTrace methodology, which is a operate that enables builders to customise the decision stack of an error that occurred within the utility. The prepareStackTrace methodology is an “error” constructor that creates an “Error” object. When an error happens and “stack” property of the thrown error object is accessed, Node.js will name this methodology whereas offering it with a string illustration of the error alongside an array of “CallSite” objects as arguments. 

The researchers began off by overriding the worldwide Error object with their very own object. This new object permits the attacker to make use of the prepareStackTrace operate with a purpose to leverage a non-sandboxed operate referred to as “getThis”, which is a operate used for returning the “this” object in a stack body. This stack body object is a non-sandboxed object that would permit an to execute capabilities that may escape the sandbox and execute code on the host that the code is operating on. 

The repair is on the market beginning with vm2 3.9.11. 


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