RestrictedPython is a tool that helps to define a subset of the Python language which allows users to provide a program input into a trusted environment. RestrictedPython does not check access to stack frames and their attributes. Stack frames are accessible within at least generators and generator expressions, which are allowed inside RestrictedPython. Prior to versions 6.1 and 5.3, an attacker with access to a RestrictedPython environment can write code that gets the current stack frame in a generator and then walk the stack all the way beyond the RestrictedPython invocation boundary, thus breaking out of the restricted sandbox and potentially allowing arbitrary code execution in the Python interpreter. All RestrictedPython deployments that allow untrusted users to write Python code in the RestrictedPython environment are at risk. In terms of Zope and Plone, this would mean deployments where the administrator allows untrusted users to create and/or edit objects of type `Script (Python)`, `DTML Method`, `DTML Document` or `Zope Page Template`. This is a non-default configuration and likely to be extremely rare. The problem has been fixed in versions 6.1 and 5.3.

The version of RestrictedPython installed on the remote host is prior to 5.3, or 6.x prior to 6.1. It is, therefore, affected by a remote code execution vulnerability due to not checking access to stack frames and their attributes. An authenticated, remote attacker can exploit this to bypass authentication and execute arbitrary commands within the current stack frame.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-7355-1 advisory.

    Nakul Choudhary and Robert Xiao discovered that RestrictedPython did not properly sanitize certain inputs.
    An attacker could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 20.04     LTS and Ubuntu 22.04 LTS. (CVE-2023-37271)

    Abhishek Govindarasu, Ankush Menat and Ward Theunisse discovered that RestrictedPython did not correctly     handle certain format strings. An attacker could possibly use this issue to leak sensitive information.
    This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2023-41039)

    It was discovered that RestrictedPython did not correctly restrict access to certain fields. An attacker     could possibly use this issue to leak sensitive information. (CVE-2024-47532)

    It was discovered that RestrictedPython contained a type confusion vulnerability. An attacker could     possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 24.04 LTS and Ubuntu     24.10. (CVE-2025-22153)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - RestrictedPython is a tool that helps to define a subset of the Python language which allows users to     provide a program input into a trusted environment. RestrictedPython does not check access to stack frames     and their attributes. Stack frames are accessible within at least generators and generator expressions,     which are allowed inside RestrictedPython. Prior to versions 6.1 and 5.3, an attacker with access to a     RestrictedPython environment can write code that gets the current stack frame in a generator and then walk     the stack all the way beyond the RestrictedPython invocation boundary, thus breaking out of the restricted     sandbox and potentially allowing arbitrary code execution in the Python interpreter. All RestrictedPython     deployments that allow untrusted users to write Python code in the RestrictedPython environment are at     risk. In terms of Zope and Plone, this would mean deployments where the administrator allows untrusted     users to create and/or edit objects of type `Script (Python)`, `DTML Method`, `DTML Document` or `Zope     Page Template`. This is a non-default configuration and likely to be extremely rare. The problem has been     fixed in versions 6.1 and 5.3. (CVE-2023-37271)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - RestrictedPython is a tool that helps to define a subset of the Python language which allows users to
    provide a program input into a trusted environment. RestrictedPython does not check access to stack frames
    and their attributes. Stack frames are accessible within at least generators and generator expressions,
    which are allowed inside RestrictedPython. Prior to versions 6.1 and 5.3, an attacker with access to a
    RestrictedPython environment can write code that gets the current stack frame in a generator and then walk
    the stack all the way beyond the RestrictedPython invocation boundary, thus breaking out of the restricted
    sandbox and potentially allowing arbitrary code execution in the Python interpreter. All RestrictedPython
    deployments that allow untrusted users to write Python code in the RestrictedPython environment are at
    risk. In terms of Zope and Plone, this would mean deployments where the administrator allows untrusted
    users to create and/or edit objects of type `Script (Python)`, `DTML Method`, `DTML Document` or `Zope
    Page Template`. This is a non-default configuration and likely to be extremely rare. The problem has been
    fixed in versions 6.1 and 5.3. (CVE-2023-37271)

ID	Name	Product	Family	Type	Severity
329023	Plone RestrictedPython < 5.3 / 6.x < 6.1 RCE	Nessus	Misc.	Local	critical
232986	Ubuntu 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 : RestrictedPython vulnerabilities (USN-7355-1)	Nessus	Ubuntu Local Security Checks	Local	high
227186	Linux Distros Unpatched Vulnerability : CVE-2023-37271	Nessus	Misc.	Local	critical
420070	SCA: security update for RestrictedPython, restrictedpython (GHSA-wqc8-x2pr-7jqh)	Tenable Cloud Security	SCA Checks	Local	critical
420070	SCA: security update for RestrictedPython, restrictedpython (GHSA-wqc8-x2pr-7jqh)	Tenable Self-Hosted Container Security	SCA Checks	Local	critical

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CVE-2023-37271

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