systemd up to v233 Username privileges management

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability has been found in systemd up to v233 and classified as critical. Impacted is an unknown function of the component Username Handler. The manipulation with the input 0example leads to input validation. This vulnerability is referenced as CVE-2017-1000082. The attack can only be performed from a local environment. Furthermore, an exploit is available. It is recommended to change the configuration settings.

Detailsinfo

A vulnerability, which was classified as critical, has been found in systemd up to v233. This issue affects an unknown part of the component Username Handler. The manipulation with the input value 0example leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

systemd v233 and earlier fails to safely parse usernames starting with a numeric digit (e.g. "0day"), running the service in question with root privileges rather than the user intended.

The bug was discovered 07/02/2017. The weakness was published 07/07/2017 (oss-sec). It is possible to read the advisory at openwall.com. The identification of this vulnerability is CVE-2017-1000082 since 07/07/2017. Attacking locally is a requirement. A simple authentication is necessary for exploitation. Technical details as well as a public exploit are known. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

It is declared as functional. The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 236564 (Alibaba Cloud Linux 3 : 0039: systemd (ALINUX3-SA-2022:0039)), which helps to determine the existence of the flaw in a target environment.

It is possible to mitigate the problem by applying the configuration setting .

The vulnerability is also documented in the databases at Tenable (236564) and SecurityFocus (BID 99507†). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.8
VulDB Temp Score: 7.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Access: Public
Status: Functional

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 236564
Nessus Name: Alibaba Cloud Linux 3 : 0039: systemd (ALINUX3-SA-2022:0039)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Config
Status: 🔍

0-Day Time: 🔍

Timelineinfo

07/02/2017 🔍
07/02/2017 +0 days 🔍
07/07/2017 +5 days 🔍
07/07/2017 +0 days 🔍
07/07/2017 +0 days 🔍
07/08/2017 +1 days 🔍
05/21/2025 +2874 days 🔍

Sourcesinfo

Product: github.com

Advisory: 6237
Researcher: Daniel Skowronski
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-1000082 (🔍)
GCVE (CVE): GCVE-0-2017-1000082
GCVE (VulDB): GCVE-100-103295
SecurityFocus: 99507 - systemd CVE-2017-1000082 Local Privilege Escalation Vulnerability
SecurityTracker: 1038839

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 07/08/2017 16:54
Updated: 05/21/2025 21:09
Changes: 07/08/2017 16:54 (63), 10/24/2019 12:55 (3), 12/31/2020 10:20 (2), 12/31/2020 10:27 (1), 12/12/2022 08:12 (3), 10/11/2024 21:06 (18), 04/24/2025 04:43 (4), 05/21/2025 21:09 (3)
Complete: 🔍
Cache ID: 216:82B:103

Be aware that VulDB is the high quality source for vulnerability data.

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