Xen up to 4.9.x HVM Guest information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.9$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Xen up to 4.9.x. This vulnerability affects unknown code. Performing a manipulation as part of HVM Guest results in information disclosure. This vulnerability is cataloged as CVE-2017-15589. The attack must be initiated from a local position. There is no exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Xen up to 4.9.x (Virtualization Software). It has been classified as problematic. This affects an unknown code. The manipulation as part of a HVM Guest leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

An issue was discovered in Xen through 4.9.x allowing x86 HVM guest OS users to obtain sensitive information from the host OS (or an arbitrary guest OS) because intercepted I/O operations can cause a write of data from uninitialized hypervisor stack memory.

The bug was discovered 10/12/2017. The weakness was shared 10/18/2017 with Citrix as XSA-239 as confirmed security advisory (Website). It is possible to read the advisory at xenbits.xen.org. This vulnerability is uniquely identified as CVE-2017-15589 since 10/18/2017. The exploitability is told to be easy. Attacking locally is a requirement. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 6 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 103927 (Citrix XenServer Multiple Vulnerabilities (CTX228867)), 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 170438 (SUSE Enterprise Linux Security Update for xen (SUSE-SU-2017:2864-1)).

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 databases at Tenable (103927) and SecurityFocus (BID 101496†). The entries VDB-98144, VDB-107978, VDB-107980 and VDB-107981 are related to this item. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

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

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

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
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: 103927
Nessus Name: Citrix XenServer Multiple Vulnerabilities (CTX228867)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 850584
OpenVAS Name: SuSE Update for xen openSUSE-SU-2017:2821-1 (xen)
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

10/12/2017 🔍
10/18/2017 +6 days 🔍
10/18/2017 +0 days 🔍
10/18/2017 +0 days 🔍
10/18/2017 +0 days 🔍
10/18/2017 +0 days 🔍
10/18/2017 +0 days 🔍
10/18/2017 +0 days 🔍
01/17/2021 +1187 days 🔍

Sourcesinfo

Advisory: XSA-239
Researcher: Roger Pau Monné
Organization: Citrix
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-15589 (🔍)
GCVE (CVE): GCVE-0-2017-15589
GCVE (VulDB): GCVE-100-107979

OVAL: 🔍

SecurityFocus: 101496 - Xen CVE-2017-15589 Information Disclosure Vulnerability
SecurityTracker: 1039568

See also: 🔍

Entryinfo

Created: 10/19/2017 00:22
Updated: 01/17/2021 09:58
Changes: 10/19/2017 00:22 (77), 11/25/2019 21:01 (5), 01/17/2021 09:52 (2), 01/17/2021 09:58 (1)
Complete: 🔍
Cache ID: 216::103

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