UBUNTU-CVE-2023-30861

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Source
https://ubuntu.com/security/CVE-2023-30861
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-30861.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2023-30861
Related
Published
2023-05-02T18:15:00Z
Modified
2023-05-02T18:15:00Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
[none]
Details

Flask is a lightweight WSGI web application framework. When all of the following conditions are met, a response containing data intended for one client may be cached and subsequently sent by the proxy to other clients. If the proxy also caches Set-Cookie headers, it may send one client's session cookie to other clients. The severity depends on the application's use of the session and the proxy's behavior regarding cookies. The risk depends on all these conditions being met. 1. The application must be hosted behind a caching proxy that does not strip cookies or ignore responses with cookies. 2. The application sets session.permanent = True 3. The application does not access or modify the session at any point during a request. 4. SESSION_REFRESH_EACH_REQUEST enabled (the default). 5. The application does not set a Cache-Control header to indicate that a page is private or should not be cached. This happens because vulnerable versions of Flask only set the Vary: Cookie header when the session is accessed or modified, not when it is refreshed (re-sent to update the expiration) without being accessed or modified. This issue has been fixed in versions 2.3.2 and 2.2.5.

References

Affected packages

Ubuntu:20.04:LTS / flask

Package

Name
flask
Purl
pkg:deb/ubuntu/flask?arch=src?distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.1.1-2ubuntu0.1

Affected versions

1.*

1.0.2-3
1.1.1-2

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "1.1.1-2ubuntu0.1",
            "binary_name": "python-flask-doc"
        },
        {
            "binary_version": "1.1.1-2ubuntu0.1",
            "binary_name": "python3-flask"
        }
    ]
}

Ubuntu:22.04:LTS / flask

Package

Name
flask
Purl
pkg:deb/ubuntu/flask?arch=src?distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.0.1-2ubuntu1.1

Affected versions

1.*

1.1.2-2

2.*

2.0.1-2ubuntu1

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "2.0.1-2ubuntu1.1",
            "binary_name": "python-flask-doc"
        },
        {
            "binary_version": "2.0.1-2ubuntu1.1",
            "binary_name": "python3-flask"
        }
    ]
}