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CVE-2023-45803

Publication date 17 October 2023

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

4.2 · Medium

Score breakdown

urllib3 is a user-friendly HTTP client library for Python. urllib3 previously wouldn't remove the HTTP request body when an HTTP redirect response using status 301, 302, or 303 after the request had its method changed from one that could accept a request body (like `POST`) to `GET` as is required by HTTP RFCs. Although this behavior is not specified in the section for redirects, it can be inferred by piecing together information from different sections and we have observed the behavior in other major HTTP client implementations like curl and web browsers. Because the vulnerability requires a previously trusted service to become compromised in order to have an impact on confidentiality we believe the exploitability of this vulnerability is low. Additionally, many users aren't putting sensitive data in HTTP request bodies, if this is the case then this vulnerability isn't exploitable. Both of the following conditions must be true to be affected by this vulnerability: 1. Using urllib3 and submitting sensitive information in the HTTP request body (such as form data or JSON) and 2. The origin service is compromised and starts redirecting using 301, 302, or 303 to a malicious peer or the redirected-to service becomes compromised. This issue has been addressed in versions 1.26.18 and 2.0.7 and users are advised to update to resolve this issue. Users unable to update should disable redirects for services that aren't expecting to respond with redirects with `redirects=False` and disable automatic redirects with `redirects=False` and handle 301, 302, and 303 redirects manually by stripping the HTTP request body.

Read the notes from the security team

Status

Package Ubuntu Release Status
python-pip 24.04 LTS noble
Needs evaluation
23.10 mantic
Fixed 23.2+dfsg-1ubuntu0.1
23.04 lunar
Fixed 23.0.1+dfsg-1ubuntu0.2
22.04 LTS jammy
Fixed 22.0.2+dfsg-1ubuntu0.4
20.04 LTS focal
Fixed 20.0.2-5ubuntu1.10
18.04 LTS bionic
16.04 LTS xenial
14.04 LTS trusty
Needs evaluation
python-urllib3 24.04 LTS noble
Not affected
23.10 mantic
Fixed 1.26.16-1ubuntu0.1
23.04 lunar
Fixed 1.26.12-1ubuntu0.1
22.04 LTS jammy
Fixed 1.26.5-1~exp1ubuntu0.1
20.04 LTS focal
Fixed 1.25.8-2ubuntu0.3
18.04 LTS bionic
16.04 LTS xenial
14.04 LTS trusty
Needs evaluation

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Notes

mdeslaur

On focal and earlier, the python-pip package bundles python-urllib3 binaries when built. After updating python-urllib3, a no-change rebuild of python-pip is required. On jammy and later, python-urllib3 is bundled in the python-pip package and needs to be patched.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
python-urllib3

Severity score breakdown

Parameter Value
Base score 4.2 · Medium
Attack vector Adjacent
Attack complexity High
Privileges required High
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N