CVE-2023-29383

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.

Database specific

{
    "cna_assigner": "mitre",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/29xxx/CVE-2023-29383.json"
}

References

Affected packages

Git / github.com/shadow-maint/shadow

Affected ranges

Type

GIT

Repo

https://github.com/shadow-maint/shadow

Events

Introduced

Last affected

24b44b686ea2221405cfd806dede046cf1fd9584

Database specific

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "4.13"
        }
    ],
    "source": "CPE_FIELD",
    "cpe": "cpe:2.3:a:shadow_project:shadow:4.13:*:*:*:*:*:*:*"
}

Affected versions

4.*

4.10

4.12

4.12.1

4.12.2

4.13

4.2.1

4.3.0

4.3.1

4.4

4.5

4.6

4.7

4.8

4.8.1

4.9

v4.*

v4.10

v4.11.1

v4.9

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-29383.json"