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.

An update of the shadow package has been released.

According to the versions of the shadow package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - 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)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the shadow package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - 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)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2023:2066-1 advisory.

  - 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  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)

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

The remote SUSE Linux SLES12 / SLES_SAP12 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2023:2067-1 advisory.

  - 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  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)

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

The remote SUSE Linux SLES15 / SLES_SAP15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2023:2068-1 advisory.

  - 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  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)

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

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2023:2070-1 advisory.

  - 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  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)

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

The remote SUSE Linux SLES12 / SLES_SAP12 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2023:2069-1 advisory.

  - 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  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)

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

ID	Name	Product	Family	Severity
204294	Photon OS 5.0: Shadow PHSA-2024-5.0-0182	Nessus	PhotonOS Local Security Checks	medium
203245	Photon OS 4.0: Shadow PHSA-2023-4.0-0399	Nessus	PhotonOS Local Security Checks	low
188691	EulerOS 2.0 SP11 : shadow (EulerOS-SA-2023-2710)	Nessus	Huawei Local Security Checks	low
188366	EulerOS Virtualization 2.11.1 : shadow (EulerOS-SA-2023-2742)	Nessus	Huawei Local Security Checks	low
188278	EulerOS 2.0 SP11 : shadow (EulerOS-SA-2023-2668)	Nessus	Huawei Local Security Checks	low
188250	EulerOS Virtualization 2.11.0 : shadow (EulerOS-SA-2023-2773)	Nessus	Huawei Local Security Checks	low
179260	EulerOS Virtualization 2.10.1 : shadow (EulerOS-SA-2023-2549)	Nessus	Huawei Local Security Checks	low
179255	EulerOS Virtualization 2.10.0 : shadow (EulerOS-SA-2023-2568)	Nessus	Huawei Local Security Checks	low
179107	EulerOS Virtualization 2.9.1 : shadow (EulerOS-SA-2023-2519)	Nessus	Huawei Local Security Checks	low
179088	EulerOS Virtualization 2.9.0 : shadow (EulerOS-SA-2023-2532)	Nessus	Huawei Local Security Checks	low
178372	EulerOS 2.0 SP10 : shadow (EulerOS-SA-2023-2368)	Nessus	Huawei Local Security Checks	low
178344	EulerOS 2.0 SP10 : shadow (EulerOS-SA-2023-2394)	Nessus	Huawei Local Security Checks	low
178094	EulerOS 2.0 SP9 : shadow (EulerOS-SA-2023-2343)	Nessus	Huawei Local Security Checks	low
178070	EulerOS 2.0 SP9 : shadow (EulerOS-SA-2023-2323)	Nessus	Huawei Local Security Checks	low
174949	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : shadow (SUSE-SU-2023:2066-1)	Nessus	SuSE Local Security Checks	low
174946	SUSE SLES12 Security Update : shadow (SUSE-SU-2023:2067-1)	Nessus	SuSE Local Security Checks	low
174945	SUSE SLES15 Security Update : shadow (SUSE-SU-2023:2068-1)	Nessus	SuSE Local Security Checks	low
174943	SUSE SLES15 Security Update : shadow (SUSE-SU-2023:2070-1)	Nessus	SuSE Local Security Checks	low
174941	SUSE SLES12 Security Update : shadow (SUSE-SU-2023:2069-1)	Nessus	SuSE Local Security Checks	low

Detections

Analytics

CVE-2023-29383

low

Tenable Plugins

medium

low

low

low

low

low

low

low

low

low

low

low

low

low

low

low

low

low

low