CVE-2020-26275: Open redirect vulnerability
First published: Mon Dec 21 2020(Updated: )
### Impact _What kind of vulnerability is it? Who is impacted?_ Open redirect vulnerability - a maliciously crafted link to a jupyter server could redirect the browser to a different website. All jupyter servers running without a base_url prefix are technically affected, however, these maliciously crafted links can only be reasonably made for known jupyter server hosts. A link to your jupyter server may *appear* safe, but ultimately redirect to a spoofed server on the public internet. This same vulnerability was patched in upstream notebook v5.7.8. ### Patches _Has the problem been patched? What versions should users upgrade to?_ Patched in jupyter_server 1.1.1. If upgrade is not available, a workaround can be to run your server on a url prefix: ``` jupyter server --ServerApp.base_url=/jupyter/ ``` ### References [OWASP page on open redirects](https://cheatsheetseries.owasp.org/cheatsheets/Unvalidated_Redirects_and_Forwards_Cheat_Sheet.html) ### For more information If you have any questions or comments about this advisory, or vulnerabilities to report, please email our security list [security@ipython.org](mailto:security@ipython.org). Credit: Yaniv Nizry from CxSCA group at Checkmarx
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Jupyter Jupyter Server | <1.1.1 | |
| pip/jupyter-server | <1.1.1 | 1.1.1 |
Remedy
https://github.com/jupyter-server/jupyter_server/commit/85e4abccf6ea9321d29153f73b0bd72ccb3a6bca
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Reference Links
- https://advisory.checkmarx.net/advisory/CX-2020-4291
- https://github.com/jupyter-server/jupyter_server/commit/85e4abccf6ea9321d29153f73b0bd72ccb3a6bca
- https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-9f66-54xg-pc2c
- https://pypi.org/project/jupyter-server/
- https://nvd.nist.gov/vuln/detail/CVE-2020-26275
- https://github.com/pypa/advisory-database/tree/main/vulns/jupyter-server/PYSEC-2020-50.yaml
- https://pypi.org/project/jupyter-server
- https://github.com/advisories/GHSA-9f66-54xg-pc2c (Advisory)
Frequently Asked Questions
What is the vulnerability ID of this issue?
The vulnerability ID is CVE-2020-26275.
What is the severity of CVE-2020-26275?
The severity of CVE-2020-26275 is medium with a CVSS score of 6.1.
What are the affected software versions of CVE-2020-26275?
The affected software version of CVE-2020-26275 is Jupyter Server up to version 1.1.1.
What is the description of CVE-2020-26275?
CVE-2020-26275 is an open redirect vulnerability in Jupyter Server versions before 1.1.1, which could cause the server to redirect the browser to a different site.
How can I fix CVE-2020-26275?
To fix CVE-2020-26275, it is recommended to update Jupyter Server to version 1.1.1 or later.
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