Vulnerability Details : CVE-2023-40587
Pyramid is an open source Python web framework. A path traversal vulnerability in Pyramid versions 2.0.0 and 2.0.1 impacts users of Python 3.11 that are using a Pyramid static view with a full filesystem path and have a `index.html` file that is located exactly one directory above the location of the static view's file system path. No further path traversal exists, and the only file that could be disclosed accidentally is `index.html`. Pyramid version 2.0.2 rejects any path that contains a null-byte out of caution. While valid in directory/file names, we would strongly consider it a mistake to use null-bytes in naming files/directories. Secondly, Python 3.11, and 3.12 has fixed the underlying issue in `os.path.normpath` to no longer truncate on the first `0x00` found, returning the behavior to pre-3.11 Python, un an as of yet unreleased version. Fixes will be available in:Python 3.12.0rc2 and 3.11.5. Some workarounds are available. Use a version of Python 3 that is not affected, downgrade to Python 3.10 series temporarily, or wait until Python 3.11.5 is released and upgrade to the latest version of Python 3.11 series.
Vulnerability category: Directory traversal
Products affected by CVE-2023-40587
- cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
- cpe:2.3:a:agendaless:pyramid:*:*:*:*:*:python:*:*
Exploit prediction scoring system (EPSS) score for CVE-2023-40587
0.10%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 42 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2023-40587
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
3.9
|
1.4
|
NIST | |
4.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |
2.8
|
1.4
|
GitHub, Inc. |
CWE ids for CVE-2023-40587
-
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.Assigned by:
- nvd@nist.gov (Secondary)
- security-advisories@github.com (Primary)
References for CVE-2023-40587
-
https://github.com/python/cpython/issues/106242
os.path.normpath truncates input on null bytes in 3.11, but not 3.10 · Issue #106242 · python/cpython · GitHubIssue Tracking;Third Party Advisory
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https://github.com/Pylons/pyramid/commit/347d7750da6f45c7436dd0c31468885cc9343c85
fix: reject NUL character as path element · Pylons/pyramid@347d775 · GitHubPatch
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https://github.com/python/cpython/pull/106816
gh-106242: Fix path truncation in normpath by finnagin · Pull Request #106816 · python/cpython · GitHubPatch
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https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OQIPHQTM3XE5NIEXCTQFV2J2RK2YUSMT/
[SECURITY] Fedora 38 Update: python-pyramid-2.0.2-1.fc38 - package-announce - Fedora Mailing-ListsMailing List
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https://github.com/Pylons/pyramid/security/advisories/GHSA-j8g2-6fc7-q8f8
Pyramid static view path traversal up one directory · Advisory · Pylons/pyramid · GitHubPatch;Vendor Advisory
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https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LYSDTQ7NP5GHPQ7HBE47MBJQK7YEIYMF/
[SECURITY] Fedora 39 Update: python-pyramid-2.0.2-1.fc39 - package-announce - Fedora Mailing-ListsMailing List
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