Citrix XenApp/XenDesktop 6.x/7.x Memory 7pk security

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.4$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Citrix XenApp and XenDesktop 6.x/7.x. This impacts an unknown function of the component Memory Handler. This manipulation causes 7pk security. This vulnerability is handled as CVE-2016-6493. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical was found in Citrix XenApp and XenDesktop 6.x/7.x (Connectivity Software). Affected by this vulnerability is an unknown code of the component Memory Handler. The manipulation with an unknown input leads to a 7pk security vulnerability. The CWE definition for the vulnerability is CWE-254. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Citrix XenApp 6.x before 6.5 HRP07 and 7.x before 7.9 and Citrix XenDesktop before 7.9 might allow attackers to weaken an unspecified security mitigation via vectors related to memory permission.

The weakness was released 08/03/2016 by Udi Yavo with enSilo as CTX215460 as confirmed security bulletin (Website). It is possible to read the advisory at support.citrix.com. The public release was coordinated with Citrix. This vulnerability is known as CVE-2016-6493 since 07/29/2016. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/17/2019). The attack technique deployed by this issue is T1211 according to MITRE ATT&CK. The advisory points out:

A weakness has been identified in Citrix XenApp and XenDesktop. While this issue is not directly exploitable, it could potentially weaken an existing security mitigation, resulting in a loss of defence in depth.

Upgrading to version 7.9 eliminates this vulnerability. Applying the patch 6.5 HRP07 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at SecurityFocus (BID 92316†) and SecurityTracker (ID 1036539†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.6

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: 7pk security
CWE: CWE-254
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: XenApp/XenDesktop 7.9
Patch: 6.5 HRP07

Timelineinfo

07/29/2016 🔍
08/03/2016 +5 days 🔍
08/03/2016 +0 days 🔍
08/04/2016 +1 days 🔍
08/04/2016 +0 days 🔍
08/04/2016 +0 days 🔍
08/19/2016 +15 days 🔍
03/17/2019 +940 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: CTX215460
Researcher: Udi Yavo
Organization: enSilo
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2016-6493 (🔍)
GCVE (CVE): GCVE-0-2016-6493
GCVE (VulDB): GCVE-100-90451
SecurityFocus: 92316 - Multiple Citrix Products CVE-2016-6493 Memory Permission Security Weakness
SecurityTracker: 1036539

Entryinfo

Created: 08/04/2016 12:53
Updated: 03/17/2019 21:53
Changes: 08/04/2016 12:53 (62), 03/17/2019 21:53 (13)
Complete: 🔍
Cache ID: 216:F11:103

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