For those using luarocks.org, there was a security vulnerability reported that could potentially compromise the integrity of all packages on the site. We don't see any evidence of someone exploiting it, but we've just added bunch of security and audit tools so people check over their accounts. Please read the full announcement here https://luarocks.org/security-incident-march-2019 or at the bottom of this email.
We're very sorry that this happened. We've responded by making & planning a series of security related updates to help prevent issues like this from ever happening or causing issues again.
Here's the full announcement:
Luarocks.org Security Incident March 2019
On March 4th we were made aware of a security vulnerability on LuaRocks.org. The issue was immediately patched. The vulnerability was detected by Igor Kanygin and Maksim Duyunov, Positive Research Center (Positive Technologies Company).
We did an initial audit of our logs and database and have not found any evidence of anyone attempting to exploit this issue, but we’re continuing to do an in-depth search along with providing some tools to account owners to check their own accounts.
In addition to the audit, we’re releasing a series of security related updates to give people better control over their account.
Note: If you were previously logged in, all sessions have been invalidated to transition to a new session management system. Please log in again.
Description of issue
A generate_key function was being used to generate a random string of text for API keys and password reset tokens. This function was using Lua’s math.random function instead of a cryptographically secure method.
Because LuaRocks.org is opensource, someone could gain understanding of how the system works and guess the random number generator’s seed. Using this they could attempt to guess password reset tokens and API keys. The default random number generator was also seeded using a plain Unix timestamp. The random number generator was only used for API keys and password reset tokens so the search space to guess the tokens was small, as nothing else as would have been incrementing the seed.
The piece of code responsible for this was part of LuaRocks.org from the very beginning, so the issue was exploitable from the beginning.
What’s at stake
LuaRocks.org is a package manager, so the security of accounts is critical. Package owners have a one-to-many relationship with their community, meaning a single compromised package could affect many developers, and potentially many more consumers. Although we haven’t found evidence of an exploit, we must assume the worst when planning out response.
Here’s a breakdown of how someone may have exploited the issue:
Guessing an API key – API keys give access to two methods on an account:
upload: A user can upload a brand new package or version of a package by providing a rockspec
It’s possible to overwrite an existing version’s rockspec
upload-rock: A user can upload a zip file (rock file), containing either binary or source for a particular package
It’s possible to replace an existing version’s rock files
Guessing a password reset token – A password reset token will allow someone to access your account from the web UI
The password would be changed, so you would know if your account has been tampered with
LuaRocks.org UI lacks the ability to change email address and username on an account, so a hijacked account could not be stolen
Any of the upload functions listed above can be done from the web interface
Minimal metadata about packages could be updated, like the homepage, description, or title
We’ve been using our server logs and database changes to look for signs of tampering. Sadly, LuaRocks.org is a very simple website and lacks many security logging features. Additionally, due to how our server logs were configured, we don’t have historical IP address logs. We’re addressing all of these issues to ensure we have proper logging going forward.
LuaRocks packages currently don’t have signing and verification. If we assume the worst then we must question the integrity of all packages on the site. (Package verification is now a high priority and will be added in the near future.)
We’re asking all account holders to use the new Security Audit panel from their account to review their packages. Things to look for are:
Changes to rockspecs you didn’t make
Updated rock files
It’s easier for us to verify rockspec files since they are plain text. Because rock files are zip files, it’s harder for us to verify their integrity.
We’re investigating purging all rock files and manually rebuilding them where we can while asking developers to rebuild them as well.
What we’ve done and what we will be doing
Here’s what we’ve already done:
Patched the issue and verified there are no related instances of it
Cleared all password reset tokens
Revoked all API keys
Added Security Audit page:
You can view/download all server logs we have associated to your account
You can review diffs for all rockspecs on your account
Added “Account sessions” panel so you can manage which browsers have active sessions to your account
All sessions are managed, all accounts have been logged out to support the new system.
Here’s what we’re working on now:
Implementing package signing and integrity verification of package files
This will enable us to verify that files have come directly from package maintainers, preventing any future issues concerning tampering
Adding two factor authentication to accounts on LuaRocks.org
Adding general purpose account activity log that tracks all changes to any data associated with an account
Investigating building rock files server-side, and rebuilding all existing rocks where we can
Questions and feedback
If you have any feedback or requests about how we have been or should be handling this issue please reach out. You can open a discussion on the LuaRocks.org issue tracker or email me directly, [hidden email].
We’re very sorry that this mistake made it into the codebase and was not discovered earlier. LuaRocks.org is built with security in mind, but mistakes happen. If you’re a security researcher or know someone who would like to donate their time to investigate this project further than please get in touch.
For those using luarocks.org, there was a security vulnerability reported that could potentially compromise the integrity of all packages on the site.
We don't see any evidence of someone exploiting it, but we've just added bunch of security and audit tools so people check over their accounts. Please read the full announcement here
https://luarocks.org/security-incident-march-2019 or at the bottom of this email.