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FreeBSD : cpython -- Use-after-free in unicode_escape decoder with error handler (e587b52d-38ac-11f0-b7b6-dcfe074bd614)

medium Nessus Plugin ID 237225

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Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the e587b52d-38ac-11f0-b7b6-dcfe074bd614 advisory.

 [email protected] reports:
 There is an issue in CPython when using `bytes.decode(unicode_escape, error=ignore|replace)`. If you are not using the unicode_escape encoding or an error handler your usage is not affected. To work-around this issue you may stop using the error= handler and instead wrap the bytes.decode() call in a try-except catching the DecodeError.

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

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

Solution

Update the affected packages.

See Also

https://nvd.nist.gov/vuln/detail/CVE-2025-4516

http://www.nessus.org/u?9dd6114d

Plugin Details

Severity: Medium

ID: 237225

File Name: freebsd_pkg_e587b52d38ac11f0b7b6dcfe074bd614.nasl

Version: 1.1

Type: local

Published: 5/24/2025

Updated: 5/24/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2025-4516

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 5.9

Threat Score: 2

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:python39, p-cpe:/a:freebsd:freebsd:python312, p-cpe:/a:freebsd:freebsd:python310, cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:python311

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 5/24/2025

Vulnerability Publication Date: 5/15/2025

Reference Information

CVE: CVE-2025-4516