systemd v228 Timer /src/basic/fs-util.c access control

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in systemd v228. Affected by this issue is some unknown functionality of the file /src/basic/fs-util.c of the component Timer Handler. The manipulation leads to access control. This vulnerability is traded as CVE-2016-10156. An attack has to be approached locally. Furthermore, there is an exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in systemd v228. This issue affects an unknown functionality of the file /src/basic/fs-util.c of the component Timer Handler. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A flaw in systemd v228 in /src/basic/fs-util.c caused world writable suid files to be created when using the systemd timers features, allowing local attackers to escalate their privileges to root. This is fixed in v229.

The bug was discovered 01/25/2017. The weakness was shared 01/23/2017 by Sebastian Krahmer (Website). The advisory is shared at securityfocus.com. The identification of this vulnerability is CVE-2016-10156 since 01/22/2017. An attack has to be approached locally. The successful exploitation needs a simple authentication. Technical details as well as a public exploit are known. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The exploit is available at exploit-db.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 96793 (SUSE SLED12 / SLES12 Security Update : systemd (SUSE-SU-2017:0279-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 169683 (OpenSuSE Security Update for systemd (openSUSE-SU-2017:0287-1)).

Upgrading to version v229 eliminates this vulnerability. A possible mitigation has been published 2 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (41171), Tenable (96793) and SecurityFocus (BID 95790†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 96793
Nessus Name: SUSE SLED12 / SLES12 Security Update : systemd (SUSE-SU-2017:0279-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 850584
OpenVAS Name: SuSE Update for systemd openSUSE-SU-2017:0287-1 (systemd)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: systemd v229
Patch: github.com

Timelineinfo

01/18/2017 🔍
01/22/2017 +4 days 🔍
01/23/2017 +1 days 🔍
01/23/2017 +0 days 🔍
01/23/2017 +0 days 🔍
01/25/2017 +2 days 🔍
01/25/2017 +0 days 🔍
01/26/2017 +1 days 🔍
05/14/2026 +3395 days 🔍

Sourcesinfo

Product: github.com

Advisory: 06eeacb6fe029804f296b065b3ce91e796e1cd0e⛔
Researcher: Sebastian Krahmer
Status: Confirmed

CVE: CVE-2016-10156 (🔍)
GCVE (CVE): GCVE-0-2016-10156
GCVE (VulDB): GCVE-100-95789
SecurityFocus: 95790 - systemd CVE-2016-10156 Local Privilege Escalation Vulnerability
OSVDB: - CVE-2016-10156 - systemd - Privilege Escalation Issue
SecurityTracker: 1037686

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

Entryinfo

Created: 01/23/2017 16:24
Updated: 05/14/2026 08:08
Changes: 01/23/2017 16:24 (74), 07/30/2020 09:45 (10), 11/03/2022 08:11 (5), 10/24/2024 13:02 (18), 05/14/2026 08:08 (1)
Complete: 🔍
Cache ID: 216::103

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