libvirtd up to 4.x QEMU Agent null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.6$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in libvirtd up to 4.x. This impacts an unknown function of the component QEMU Agent. Such manipulation leads to null pointer dereference. This vulnerability is listed as CVE-2019-3840. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in libvirtd up to 4.x (Virtualization Software) and classified as problematic. Affected by this issue is an unknown part of the component QEMU Agent. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. CVE summarizes:

A NULL pointer dereference flaw was discovered in libvirt before version 5.0.0 in the way it gets interface information through the QEMU agent. An attacker in a guest VM can use this flaw to crash libvirtd and cause a denial of service.

The bug was discovered 04/11/2019. The weakness was presented 03/27/2019 as Bug 1663051 as confirmed bug report (Bugzilla). The advisory is shared for download at bugzilla.redhat.com. This vulnerability is handled as CVE-2019-3840 since 01/03/2019. The attack may be launched remotely. A simple authentication is necessary for exploitation. There are neither technical details nor an exploit publicly available.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 172276 (SUSE Enterprise Linux Security Update for libvirt (SUSE-SU-2019:0948-1)).

Upgrading to version 5.0.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 107777†). See VDB-133057 and VDB-135361 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.6

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.3
NVD Vector: 🔍

CNA Base Score: 5.8
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
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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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: libvirtd 5.0.0

Timelineinfo

01/03/2019 🔍
03/27/2019 +83 days 🔍
03/28/2019 +1 days 🔍
04/03/2019 +6 days 🔍
04/11/2019 +8 days 🔍
08/17/2023 +1589 days 🔍

Sourcesinfo

Advisory: Bug 1663051
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2019-3840 (🔍)
GCVE (CVE): GCVE-0-2019-3840
GCVE (VulDB): GCVE-100-132548
SecurityFocus: 107777 - libvirt CVE-2019-3886 Security Bypass Vulnerability

See also: 🔍

Entryinfo

Created: 03/28/2019 14:14
Updated: 08/17/2023 11:26
Changes: 03/28/2019 14:14 (63), 05/22/2020 13:03 (4), 08/17/2023 11:26 (14)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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