Xen up to 4.9.x TLB Entry race condition

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.00

A vulnerability was found in Xen up to 4.9.x (Virtualization Software) and classified as critical. Affected by this issue is an unknown part of the component TLB Entry Handler. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in Xen through 4.9.x allowing x86 PV guest OS users to execute arbitrary code on the host OS because of a race condition that can cause a stale TLB entry.

The bug was discovered 10/12/2017. The weakness was presented 10/18/2017 by Jann Horn with Google Project Zero (Website). The advisory is available at securityfocus.com. This vulnerability is handled as CVE-2017-15588 since 10/18/2017. Local access is required to approach this attack. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

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 390076 (Oracle VM Server for x86 Security Update for xen (OVMSA-2017-0162)).

A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (103927). See 107979, 107980, 107982 and 107983 for similar entries.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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CVSSv3info

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

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
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: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

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: 🔍
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Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/12/2017 🔍
10/12/2017 +0 days 🔍
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 🔍
01/04/2023 +1904 days 🔍

Sourcesinfo

Advisory: DLA 1181-1⛔
Researcher: Jann Horn
Organization: Google Project Zero
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-15588 (🔍)
OVAL: 🔍

SecurityTracker: 1039568
SecurityFocus: 101490 - Xen CVE-2017-15588 Arbitrary Code Execution Vulnerability

See also: 🔍

Entryinfo

Created: 10/19/2017 00:22
Updated: 01/04/2023 07:30
Changes: 10/19/2017 00:22 (72), 11/25/2019 20:58 (7), 01/17/2021 09:46 (3), 01/04/2023 07:30 (2)
Complete: 🔍

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