Xen up to 4.10.x Local APIC null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Xen up to 4.10.x. This issue affects some unknown processing of the component Local APIC. Executing a manipulation can lead to null pointer dereference. This vulnerability is registered as CVE-2018-7542. The attack needs to be launched locally. No exploit is available. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in Xen up to 4.10.x (Virtualization Software). It has been declared as problematic. This vulnerability affects some unknown functionality of the component Local APIC. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. CVE summarizes:

An issue was discovered in Xen 4.8.x through 4.10.x allowing x86 PVH guest OS users to cause a denial of service (NULL pointer dereference and hypervisor crash) by leveraging the mishandling of configurations that lack a Local APIC.

The bug was discovered 02/27/2018. The weakness was published 02/27/2018 as XSA-256 as confirmed security advisory (Website). The advisory is shared for download at xenbits.xen.org. This vulnerability was named CVE-2018-7542 since 02/27/2018. The exploitation appears to be easy. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 107099 (Xen arch_domain_create() Function Local APIC Assumption NULL Pointer Dereference Guest-to-host DoS (XSA-256)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176312 (Debian Security Update for xen (DSA 4131-1)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (107099). Similar entries are available at VDB-113919 and VDB-113918. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.1

VulDB Base Score: 3.8
VulDB Temp Score: 3.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 107099
Nessus Name: Xen arch_domain_create() Function Local APIC Assumption NULL Pointer Dereference Guest-to-host DoS (XSA-256)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 831688
OpenVAS Name: Debian Security Advisory DSA 4131-1 (xen - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Timelineinfo

02/27/2018 🔍
02/27/2018 +0 days 🔍
02/27/2018 +0 days 🔍
02/27/2018 +0 days 🔍
02/27/2018 +0 days 🔍
02/28/2018 +1 days 🔍
03/02/2018 +2 days 🔍
02/16/2023 +1812 days 🔍

Sourcesinfo

Advisory: XSA-256
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-7542 (🔍)
GCVE (CVE): GCVE-0-2018-7542
GCVE (VulDB): GCVE-100-113920

OVAL: 🔍

SecurityTracker: 1040776

See also: 🔍

Entryinfo

Created: 02/28/2018 09:17
Updated: 02/16/2023 08:37
Changes: 02/28/2018 09:17 (74), 01/09/2020 11:08 (2), 02/16/2023 08:37 (4)
Complete: 🔍
Cache ID: 216::103

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