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GHSA-xjw2-6jm9-rf67

HighCVSS 8.3 / 10
Published Aug 30, 2023·Last modified Feb 16, 2024
Affected Components(0)

No affected components available

Description

Impact

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.

Patches

The issue will be fixed in 5.4 and 6.2.

Workarounds

There are no workarounds to fix the issue without upgrading.

References

  • https://docs.python.org/3/library/stdtypes.html#str.format_map
  • http://lucumr.pocoo.org/2016/12/29/careful-with-str-format/
  • https://www.exploit-db.com/exploits/51580

For more information

If you have any questions or comments about this advisory:

Credits

Thanks for analysing and reporting the go to:

  • Abhishek Govindarasu
  • Ankush Menat
  • Ward Theunisse
Risk Scores
Base Score
8.3

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a low impact on the availability of the system.

Threat Intelligence
7.6

Exploitation activity has been observed. Apply available patches or mitigations urgently.

EPSS
0.64%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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