Detections
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Echo: shadow: security update to 1:4.13+dfsg1-1+deb12u1

low Tenable Cloud Security Plugin ID 459794

Description

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

 - In Shadow 4.13, it is possible to inject control characters into fields provided to the SUID program chfn
 (change finger). Although it is not possible to exploit this directly (e.g., adding a new user fails
 because \n is in the block list), it is possible to misrepresent the /etc/passwd file when viewed. Use of
 \r manipulations and Unicode characters to work around blocking of the : character make it possible to
 give the impression that a new user has been added. In other words, an adversary may be able to convince a
 system administrator to take the system offline (an indirect, social-engineered denial of service) by
 demonstrating that "cat /etc/passwd" shows a rogue user account. (CVE-2023-29383)

Solution

Update the shadow library and its related packages to version 1:4.13+dfsg1-1+deb12u1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2023-29383

Plugin Details

Severity: Low

ID: 459794

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Low

Base Score: 1.7

Temporal Score: 1.3

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

CVSS Score Source: CVE-2023-29383

CVSS v3

Risk Factor: Low

Base Score: 3.3

Temporal Score: 3

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

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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/29/2026

Vulnerability Publication Date: 4/14/2023

Reference Information

CVE: CVE-2023-29383