Citrix Access Gateway Plugin up to 9.3.49.5 on Windows nsepa.exe StartEPA memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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9.0$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Citrix Access Gateway Plugin up to 9.3.49.5 on Windows. Affected is the function StartEPA of the file nsepa.exe. Such manipulation leads to memory corruption. This vulnerability is documented as CVE-2011-2592. Additionally, an exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Citrix Access Gateway Plugin up to 9.3.49.5 on Windows (Connectivity Software). Affected by this issue is the function StartEPA of the file nsepa.exe. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability.

The weakness was released 08/01/2012 by Dmitriy Pletnev with Secunia as Secunia Research 01/08/2012 as confirmed advisory (Website). The advisory is available at secunia.com. The vendor was not involved in the coordination of the public release. This vulnerability is handled as CVE-2011-2592 since 06/29/2011. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a private exploit are known.

It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 379 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 62777 (Citrix Access Gateway Plug-in for Windows ActiveX Control StartEPA() Method HTTP Response Header Parsing Overflows (CTX134303)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows. The commercial vulnerability scanner Qualys is able to test this issue with plugin 122597 (Citrix Access Gateway Plug-in nsepacom ActiveX Control (nsepa.exe) Code Execution Vulnerability).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 12271.

The vulnerability is also documented in the databases at X-Force (77316), Tenable (62777), SecurityFocus (BID 54754†), OSVDB (84433†) and Secunia (SA45299†). Entry connected to this vulnerability is available at VDB-70597. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.0

VulDB Base Score: 10.0
VulDB Temp Score: 9.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Private
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 62777
Nessus Name: Citrix Access Gateway Plug-in for Windows ActiveX Control StartEPA() Method HTTP Response Header Parsing Overflows (CTX134303)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

McAfee IPS: 🔍
McAfee IPS Version: 🔍

ISS Proventia IPS: 🔍
PaloAlto IPS: 🔍
Fortigate IPS: 🔍

Timelineinfo

06/29/2011 🔍
07/19/2011 +20 days 🔍
07/21/2011 +2 days 🔍
08/01/2012 +377 days 🔍
08/01/2012 +0 days 🔍
08/01/2012 +0 days 🔍
08/01/2012 +0 days 🔍
08/01/2012 +0 days 🔍
08/09/2012 +8 days 🔍
08/10/2012 +1 days 🔍
10/14/2012 +65 days 🔍
10/31/2012 +17 days 🔍
06/18/2014 +595 days 🔍
03/27/2021 +2474 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: Secunia Research 01/08/2012⛔
Researcher: Dmitriy Pletnev
Organization: Secunia
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2011-2592 (🔍)
GCVE (CVE): GCVE-0-2011-2592
GCVE (VulDB): GCVE-100-5906

IAVM: 🔍

X-Force: 77316
SecurityFocus: 54754 - Citrix Access Gateway Plug-in ActiveX Control Multiple Code Execution Vulnerabilities
Secunia: 45299 - Citrix Access Gateway Plug-in for Windows nsepacom ActiveX Control Vulnerabilities, Highly Critical
OSVDB: 84433
SecurityTracker: 1027335 - Citrix Access Gateway Plug-in for Windows ActiveX Control Buffer Overflows Let Remote Users Execute Arbitrary Code
Vulnerability Center: 36534 - Citrix Access Gateway 9.3.49.5 Remote Code Execution via a too Long \, Critical

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 08/10/2012 11:41
Updated: 03/27/2021 09:26
Changes: 08/10/2012 11:41 (86), 04/18/2017 11:28 (15), 03/27/2021 09:19 (2), 03/27/2021 09:26 (1)
Complete: 🔍
Cache ID: 216:501:103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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