systemd up to 233 Mount Request race condition

CVSS Meta Temp Score
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CTI Interest Score
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4.6$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in systemd up to 233. Affected is an unknown function of the component Mount Handler. The manipulation as part of Request results in race condition. This vulnerability was named CVE-2018-1049. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in systemd up to 233. Affected is an unknown part of the component Mount Handler. The manipulation as part of a Request leads to a race condition vulnerability. CWE is classifying the issue as CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. This is going to have an impact on availability. CVE summarizes:

In systemd prior to 234 a race condition exists between .mount and .automount units such that automount requests from kernel may not be serviced by systemd resulting in kernel holding the mountpoint and any processes that try to use said mount will hang. A race condition like this may lead to denial of service, until mount points are unmounted.

The bug was discovered 01/19/2018. The weakness was presented 02/16/2018 by Jann Horn with Google Project Zero as Bug 1534701 as confirmed bug report (Bugzilla). The advisory is shared for download at bugzilla.redhat.com. This vulnerability is traded as CVE-2018-1049 since 12/04/2017. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 12 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 106553 (RHEL 7 : systemd (RHSA-2018:0260)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Red Hat Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197044 (Ubuntu Security Notification for Systemd Vulnerabilities (USN-3558-1)).

Upgrading to version 234 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (106553) and SecurityFocus (BID 105747†). See VDB-108646 and VDB-125996 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

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Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 106553
Nessus Name: RHEL 7 : systemd (RHSA-2018:0260)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 863318
OpenVAS Name: Ubuntu Update for systemd USN-3558-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: systemd 234

Timelineinfo

12/04/2017 🔍
01/19/2018 +46 days 🔍
01/31/2018 +12 days 🔍
02/01/2018 +1 days 🔍
02/16/2018 +15 days 🔍
02/16/2018 +0 days 🔍
02/17/2018 +1 days 🔍
10/26/2018 +251 days 🔍
02/04/2021 +832 days 🔍

Sourcesinfo

Advisory: Bug 1534701
Researcher: Jann Horn
Organization: Google Project Zero
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-1049 (🔍)
GCVE (CVE): GCVE-0-2018-1049
GCVE (VulDB): GCVE-100-113508
SecurityFocus: 105747 - systemd CVE-2018-15686 Local Privilege Escalation Vulnerability
SecurityTracker: 1041520

See also: 🔍

Entryinfo

Created: 02/17/2018 11:18
Updated: 02/04/2021 10:13
Changes: 02/17/2018 11:18 (77), 01/11/2020 08:17 (6), 02/04/2021 10:13 (3)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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