Citrix Access Gateway up to 8.0 ActiveX Control nsepa.ocx memory corruption
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
9.5 | $0-$5k | 0.00 |
A vulnerability was found in Citrix Access Gateway up to 8.0 (Connectivity Software). It has been rated as very critical. This issue affects some unknown processing of the file nsepa.ocx of the component ActiveX Control. 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 summary by CVE is:
Stack-based buffer overflow in the NSEPA.NsepaCtrl.1 ActiveX control in nsepa.ocx in Citrix Access Gateway Enterprise Edition 8.1 before 8.1-67.7, 9.0 before 9.0-70.5, and 9.1 before 9.1-96.4 allows remote attackers to execute arbitrary code via crafted HTTP header data.
The weakness was published 07/21/2011 by Joshua J. Drake (Website). The advisory is shared at securityreason.com. The identification of this vulnerability is CVE-2011-2882. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/15/2021).
A public exploit has been developed by Metasploit in Ruby and been published 2 months after the advisory. The exploit is available at securityfocus.com. It is declared as highly functional. We expect the 0-day to have been worth approximately $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 55653 (Citrix Access Gateway Plug-in for Windows ActiveX Control Multiple Vulnerabilities (CTX129902)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows.
Upgrading to version 8.1 eliminates this 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 Tenable (55653) and Exploit-DB (17762). Similar entry is available at 58086.
Product
Type
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
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CVSSv3
VulDB Meta Base Score: 10.0VulDB Meta Temp Score: 9.5
VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv2
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VulDB Base Score: 🔍
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Exploiting
Class: Memory corruptionCWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍
Local: No
Remote: Yes
Availability: 🔍
Access: Public
Status: Highly functional
Author: Metasploit
Programming Language: 🔍
Download: 🔍
EPSS Score: 🔍
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Price Prediction: 🔍
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Nessus ID: 55653
Nessus Name: Citrix Access Gateway Plug-in for Windows ActiveX Control Multiple Vulnerabilities (CTX129902)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Saint ID: exploit_info/citrix_access_gateway_activex_nsepa
Saint Name: Citrix Access Gateway NESPA ActiveX Control
MetaSploit ID: citrix_gateway_actx.rb
MetaSploit Name: Citrix Gateway ActiveX Control Stack Based Buffer Overflow Vulnerability
MetaSploit File: 🔍
Exploit-DB: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
0-Day Time: 🔍
Exploit Delay Time: 🔍
Upgrade: Access Gateway 8.1
TippingPoint: 🔍
McAfee IPS: 🔍
McAfee IPS Version: 🔍
PaloAlto IPS: 🔍
Fortigate IPS: 🔍
Timeline
07/14/2011 🔍07/21/2011 🔍
07/21/2011 🔍
07/21/2011 🔍
07/21/2011 🔍
07/22/2011 🔍
07/25/2011 🔍
08/31/2011 🔍
08/31/2011 🔍
03/23/2015 🔍
11/15/2021 🔍
Sources
Vendor: citrix.comAdvisory: securityreason.com
Researcher: Joshua J. Drake
Status: Confirmed
CVE: CVE-2011-2882 (🔍)
Vulnerability Center: 32418 - Citrix Access Gateway Enterprise Edition Remote Stack-Based Buffer Overflow Vulnerability, Medium
SecurityFocus: 48676 - Citrix Access Gateway Plug-in ActiveX Control Multiple Code Execution Vulnerabilities
scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍
Entry
Created: 03/23/2015 16:50Updated: 11/15/2021 13:43
Changes: 03/23/2015 16:50 (68), 03/28/2017 10:34 (18), 11/15/2021 13:37 (2), 11/15/2021 13:43 (1)
Complete: 🔍
Cache ID: 3:72B:103
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