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Ubuntu Security Notice USN-6155-1

Ubuntu Security Notice 6155-1 - Dennis Brinkrolf and Tobias Funke discovered that Requests incorrectly leaked Proxy-Authorization headers. A remote attacker could possibly use this issue to obtain sensitive information.

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Ubuntu Security Notice USN-6155-1
June 12, 2023

requests vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 23.04
  • Ubuntu 22.10
  • Ubuntu 22.04 LTS
  • Ubuntu 20.04 LTS

Summary:

Requests could be made to expose sensitive information over the network.

Software Description:

  • requests: elegant and simple HTTP library for Python

Details:

Dennis Brinkrolf and Tobias Funke discovered that Requests incorrectly
leaked Proxy-Authorization headers. A remote attacker could possibly use
this issue to obtain sensitive information.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 23.04:
python3-requests 2.28.1+dfsg-1ubuntu1.1

Ubuntu 22.10:
python3-requests 2.27.1+dfsg-1ubuntu2.1

Ubuntu 22.04 LTS:
python3-requests 2.25.1+dfsg-2ubuntu0.1

Ubuntu 20.04 LTS:
python3-requests 2.22.0-2ubuntu1.1

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6155-1
CVE-2023-32681

Package Information:
https://launchpad.net/ubuntu/+source/requests/2.28.1+dfsg-1ubuntu1.1
https://launchpad.net/ubuntu/+source/requests/2.27.1+dfsg-1ubuntu2.1
https://launchpad.net/ubuntu/+source/requests/2.25.1+dfsg-2ubuntu0.1
https://launchpad.net/ubuntu/+source/requests/2.22.0-2ubuntu1.1

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### Impact Since Requests v2.3.0, Requests has been vulnerable to potentially leaking `Proxy-Authorization` headers to destination servers, specifically during redirects to an HTTPS origin. This is a product of how `rebuild_proxies` is used to recompute and [reattach the `Proxy-Authorization` header](https://github.com/psf/requests/blob/f2629e9e3c7ce3c3c8c025bcd8db551101cbc773/requests/sessions.py#L319-L328) to requests when redirected. Note this behavior has _only_ been observed to affect proxied requests when credentials are supplied in the URL user information component (e.g. `https://username:password@proxy:8080`). **Current vulnerable behavior(s):** 1. HTTP → HTTPS: **leak** 2. HTTPS → HTTP: **no leak** 3. HTTPS → HTTPS: **leak** 4. HTTP → HTTP: **no leak** For HTTP connections sent through the proxy, the proxy will identify the header in the request itself and remove it prior to forwarding to the destination server. However when sent over HTTPS, the `Proxy-Authorization` head...

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