CVE-2023-32681
Published: 26 May 2023
Requests is a HTTP library. Since Requests 2.3.0, Requests has been leaking Proxy-Authorization headers to destination servers when redirected to an HTTPS endpoint. This is a product of how we use `rebuild_proxies` to reattach the `Proxy-Authorization` header to requests. For HTTP connections sent through the tunnel, 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` header must be sent in the CONNECT request as the proxy has no visibility into the tunneled request. This results in Requests forwarding proxy credentials to the destination server unintentionally, allowing a malicious actor to potentially exfiltrate sensitive information. This issue has been patched in version 2.31.0.
Notes
| Author | Note |
|---|---|
| mdeslaur | On focal and earlier, the python-pip package bundles requests binaries when built. After updating requests, a no-change rebuild of python-pip is required. On jammy and later, requests is bundled in the python-pip package and needs to be patched. |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
python-pip Launchpad, Ubuntu, Debian |
bionic |
Needs triage
|
| focal |
Released
(20.0.2-5ubuntu1.9)
|
|
| trusty |
Needs triage
|
|
| upstream |
Needs triage
|
|
| xenial |
Needs triage
|
|
| jammy |
Needed
|
|
| kinetic |
Ignored
(end of life, was needs-triage)
|
|
| lunar |
Needed
|
|
| mantic |
Not vulnerable
(23.2+dfsg-1)
|
|
|
requests Launchpad, Ubuntu, Debian |
bionic |
Released
(2.18.4-2ubuntu0.1+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
| trusty |
Needs triage
|
|
| upstream |
Released
(2.31.0)
|
|
| xenial |
Released
(2.9.1-3ubuntu0.1+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| lunar |
Released
(2.28.1+dfsg-1ubuntu1.1)
|
|
| focal |
Released
(2.22.0-2ubuntu1.1)
|
|
| jammy |
Released
(2.25.1+dfsg-2ubuntu0.1)
|
|
| kinetic |
Released
(2.27.1+dfsg-1ubuntu2.1)
|
|
| mantic |
Released
(2.28.1+dfsg-1ubuntu2)
|
|
|
Patches: upstream: https://github.com/psf/requests/commit/74ea7cf7a6a27a4eeb2ae24e162bcc942a6706d5 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.1 |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | Required |
| Scope | Changed |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N |