// For flags

CVE-2023-41039

Sandbox escape via various forms of "format" in RestrictedPython

Severity Score

7.7
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

RestrictedPython is a restricted execution environment for Python to run untrusted code. Python's "format" functionality allows someone controlling the format string to "read" all objects accessible through recursive attribute lookup and subscription from objects he can access. This can lead to critical information disclosure. With `RestrictedPython`, the format functionality is available via the `format` and `format_map` methods of `str` (and `unicode`) (accessed either via the class or its instances) and via `string.Formatter`. All known versions of `RestrictedPython` are vulnerable. This issue has been addressed in commit `4134aedcff1` which has been included in the 5.4 and 6.2 releases. Users are advised to upgrade. There are no known workarounds for this vulnerability.

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. 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.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low
Attack Vector
Network
Attack Complexity
Low
Authentication
Single
Confidentiality
Complete
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
None
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2023-08-22 CVE Reserved
  • 2023-08-30 CVE Published
  • 2024-10-01 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Zope
Search vendor "Zope"
 Restrictedpython
Search vendor "Zope" for product "Restrictedpython"
 < 5.4
Search vendor "Zope" for product "Restrictedpython" and version " < 5.4"
-
Affected
Zope
Search vendor "Zope"
 Restrictedpython
Search vendor "Zope" for product "Restrictedpython"
 >= 6.0 < 6.2
Search vendor "Zope" for product "Restrictedpython" and version " >= 6.0 < 6.2"
-
Affected