Codecov Hacked! What To Do Now if You Use Codecov – CloudSavvy IT

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Codecov Bash uploader script with line of injected code highlighted

Codecov was hacked in a approach that impacts all of its clients. 1000’s of business enterprises and open-source initiatives are affected. Right here’s what it’s worthwhile to do if you happen to’re one among them.

What’s Codecov?

In case you’re not concerned with continuous integration and continuous deployment/delivery (CI/CD) or different software program improvement automation, you won’t be aware of the title Codecov.

Codecov offers a hosted service that tells builders how a lot of their supply code has been checked by the automated assessments which are a part of their software program construct course of. It’s a metric known as code protection. Sophisticated software program initiatives can have hundreds of supply code recordsdata. Understanding the code protection tells you the way efficient your testing really is as a result of untested code would possibly harbor bugs.

There are various doable paths of execution inside non-trivial code. Writing assessments that verify all the paths is troublesome. Principally, you’re writing code to search out flaws in different code. But when your check code isn’t designed and written accurately it received’t cowl all doable execution paths. Which means there’ll be holes in your code protection.

Codecov reads the output generated by your construct course of and produces experiences that present precisely which execution paths your check code has missed. You may add assessments to cowl these areas or modify the logic of present assessments to make them totally train the routine they’re supposed to check.

Code protection is significant to producing steady software program, particularly with giant groups of builders. You may inform how significantly that is taken by a few of Codecov’s 29,000 clients. Organizations like KubernetesMozilla, HashiCorp, and Atlassian all depend on Codecov for his or her code protection experiences. And since Codecov is free to open-source initiatives, there are literally thousands of open-source initiatives utilizing Codecov too.

That’s why it’s such a very good goal for cybercriminals.

Provide-Chain Assaults

A supply-chain assault compromises a provider or service supplier so as to compromise the true targets—all of their clients and customers. If you wish to poison a complete city you’re not going to go home to accommodate. You’ll poison the water remedy plant and wait.

That is what occurred within the latest SolarWinds assault. SolarWinds wasn’t the goal, they had been simply an environment friendly route for the risk actors to get in any respect of SolarWinds’ clients. And since Solarwinds’ clients for probably the most half had been managed service suppliers and outsourced IT assist organizations, all of their clients had been uncovered to danger as properly.

RELATED: SolarWinds Hack: What Happened and How To Protect Yourself

The Codecov Assault

On April 15, 2021, Codecov publicly disclosed that a Bash script used to add recordsdata to its servers had been modified by risk actors. The preliminary compromise at Codecov is believed to have occurred in late January 2021. The compromised script collected delicate data from clients’ steady integration environments and uploaded that data to the attacker’s server. Entry credentials reminiscent of ID tokens and API keys in addition to something saved in setting variables had been harvested by the modified script.

It was a basic supply-chain assault. By injecting a single line of code into Codecov’s Bash uploader script, the risk actors had the means to entry the continual integration environments of all clients that used the script. And since that script is utilized in three of Codecov’s importing routines—Codecov-actions, CircleCl Orb, and Bitrise Step—only a few Codecov clients wouldn’t be uncovered to this danger.

That doesn’t imply all clients have been breached, simply that they’ve been uncovered to the specter of unauthorized entry. HashiCorp is one buyer identified to have been compromised, whereas others reminiscent of Atlassian and Hewlett Packard Enterprises have not discovered any evidence of compromise.

The risk actors gained entry to the Codecov infrastructure by means of a poorly configured Docker container. They added a line to the Bash uploader script at line 525 within the file. We will isolate the brand new line utilizing the  colordiff command. The diff command would work simply as properly, however the colordiff output is just a little simpler to learn, being color-coded. It’s out there in all Linux distribution repositories.


The IP tackle of the attacker’s server was, which is a digital server hosted by Digital Ocean.

IP identity for the attacker's server

Evidently, the cybercriminals received’t use an IP tackle that factors again to themselves.

As quickly as Codecov found the compromise they took steps to shut down the unauthorized entry, talk to their clients, and examine the incident. Codecov has:

  • Collaborated with Digital Ocean to have the risk actor’s server taken down.
  • Regenerated and up to date all affected or probably affected Codecov credentials and closed off the unauthorized entry that allowed the uploader script to be modified.
  • Checked their infrastructure logs to find out how the unauthorized entry was doable, and which authentication key was used.
  • Improved or applied community monitoring and auditing instruments at key factors of their infrastructure to detect and stop a recurrence of any such assault.

Affected? What You Ought to Do Now

Codecov has emailed all clients they imagine are in danger. Whether or not you could have heard from them or not, in case your group is a buyer of Codecov it’s important to assume that you’re susceptible to compromise.

As a result of credentials, connection keys, and different delicate and confidential data are handed from step to step of the CI/CD course of, the risk actors could have harvested these particulars. They could have been in a position to collect and retrieve:

  • Any authentication or privilege credentials, tokens, or keys that had been accessible to the script whereas buyer CI/CD processes had been operating.
  • Any third-party companies, knowledge, or supply code that might be accessed by the CI/Cd processes.
  • The git distant repository particulars.

You may simply verify what’s within the setting variables of your CI/CD setting by utilizing the  env command and piping it into much less to make it more manageable:

env | much less
  • Evaluation the output and if there’s something that’s delicate or permits any sort of entry, change the credentials on that account, platform, or service.
  • In case you are utilizing an area copy of the Bash uploader script you’re unlikely to have been affected, however you’re nonetheless inspired to interchange that native script with the latest version.
  • Audit your system for tried use by the invalidated credentials and keys. If makes an attempt are detected, it means the risk actors try to make use of the knowledge they’ve exfiltrated out of your CI/CD platform to get in.

Act defensively. If there’s any suspicion or chance of compromise, regenerate the related credentials and keys instantly.

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