A security team from one of our partners noticed an issue in Next.js that allowed for an open redirect to occur.
Specially encoded paths could be used when pages/_error.js was statically generated allowing an open redirect to occur to an external site.
In general, this redirect does not directly harm users although can allow for phishing attacks by redirecting to an attacker's domain from a trusted domain.
We recommend upgrading to the latest version of Next.js to improve the overall security of your application.
How to Upgrade
We have released patch versions for both the stable and canary channels of Next.js.
To upgrade run npm install next@latest --save
Impact
Affected: Users of Next.js between 10.0.5 and 10.2.0
Affected: Users of Next.js between 11.0.0 and 11.0.1 using pages/_error.js without getInitialProps
Affected: Users of Next.js between 11.0.0 and 11.0.1 using pages/_error.js and next export
Not affected: Deployments on Vercel (vercel.com) are not affected
Not affected: Deployments withpages/404.js
We recommend everyone to upgrade regardless of whether you can reproduce the issue or not.
How to Assess Impact
If you think sensitive code or data could have been exposed, you can filter logs of affected sites by // (double slash at the start of the url) followed by a domain.
What is Being Done
As Next.js has grown in popularity and usage by enterprises, it has received the attention of security researchers and auditors. We are thankful to Gabriel Benmergui from Robinhood for their investigation and discovery of the original bug and subsequent responsible disclosure.
We've landed a patch that ensures path parsing is handled properly for these paths so that the open redirect can no longer occur.
Regression tests for this attack were added to the security integration test suite
We have notified known Next.js users in advance of this publication.
A public CVE was released.
We encourage responsible disclosure of future reports. Please email us at security@vercel.com. We are actively monitoring this mailbox.
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Bumps next from 11.0.0 to 11.1.0.
Release notes
Sourced from next's releases.
... (truncated)
Commits
ce4adfc
v11.1.0092a476
v11.0.2-canary.31ebb6a30
Revert "Add warning duringnext build
when sharp is missing (#27933)"52486ce
v11.0.2-canary.308ac3254
Revert "Next swc publish flow (#27932)"6014b6e
v11.0.2-canary.294cd45aa
Add rootDir setting to eslint-plugin-next (#27918)e61ea6f
Add manifest check step and add missing items (#27934)94fc6f0
Next swc publish flow (#27932)51a2a02
Add warning duringnext build
when sharp is missing (#27933)Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
@dependabot rebase
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