Log in Start free

Vulnerability · Published Aug 25, 2023 · Assigned by GitHub_M

CVE-2023-40587Pyramid static view path traversal up one directory

Medium 4.3

In plain English

A medium-severity path traversal in pyramid from Pylons. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 55% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.8%top 44.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12python-pyramid2.0+dfsg-2+deb12u1DEBIAN-CVE-2023-40587
Debian:13python-pyramid2.0.2+dfsg-1DEBIAN-CVE-2023-40587
Debian:14python-pyramid2.0.2+dfsg-1DEBIAN-CVE-2023-40587
PyPIpyramid2.0.2GHSA-j8g2-6fc7-q8f8
PyPIpyramid2.0.2PYSEC-2026-1840
Ubuntu:22.04:LTSpython-pyramidno fix listedUBUNTU-CVE-2023-40587
Ubuntu:24.04:LTSpython-pyramidno fix listedUBUNTU-CVE-2023-40587
Ubuntu:25.10python-pyramidno fix listedUBUNTU-CVE-2023-40587
Ubuntu:26.04:LTSpython-pyramidno fix listedUBUNTU-CVE-2023-40587
Ubuntu:26.10python-pyramidno fix listedUBUNTU-CVE-2023-40587

Affected products (as reported)

VendorProductVersions
Pylons pyramid >= 2.0.0, < 2.0.2

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

References