CVE-2008-4343

Chilkat XML ActiveX Control < 3.0.3.0 - Arbitrary File Write via SaveToFile, SaveToTempFile, or AppendBinary Method

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2008-4343. PoCs published by shinnai.

AI-analyzed exploit summary This exploit leverages the Chilkat XML ActiveX control (CLSID: {5022FAE8-B780-4B78-B8DC-1AF1145A4F42}) to create and execute arbitrary files via the SaveToFile() and AppendBinary() methods. It writes a malicious executable to C:\HelloWorld.exe and triggers execution using the hcp:// protocol via a crafted HTML file.

Description

The Chilkat XML ChilkatUtil.CkData.1 ActiveX control (ChilkatUtil.dll) 3.0.3.0 and earlier allows remote attackers to create, overwrite, and modify arbitrary files for execution via a call to the (1) SaveToFile, (2) SaveToTempFile, or (3) AppendBinary method. NOTE: this issue might only be exploitable in limited environments or non-default browser settings. NOTE: this can be leveraged for remote code execution by accessing files using hcp:// URLs.

Exploits (1)

exploitdb WORKING POC VERIFIED
by shinnai · htmlremotewindows
https://www.exploit-db.com/exploits/6537

This exploit leverages the Chilkat XML ActiveX control (CLSID: {5022FAE8-B780-4B78-B8DC-1AF1145A4F42}) to create and execute arbitrary files via the SaveToFile() and AppendBinary() methods. It writes a malicious executable to C:\HelloWorld.exe and triggers execution using the hcp:// protocol via a crafted HTML file.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: ChilkatUtil.dll <= 3.0.3.0
No auth needed
Prerequisites: Victim must open a malicious HTML file in Internet Explorer · ChilkatUtil.dll <= 3.0.3.0 must be installed
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (5)

Core 5
Core References
Vendor Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/31951
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/45333
Exploit, Third Party Advisory exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/6537
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/31332
Exploit, URL Repurposed x_refsource_misc
http://www.shinnai.net/xplits/TXT_rNowA1916DKFNUF48NyS

Scores

EPSS 0.0868
EPSS Percentile 94.4%

Details

CWE
CWE-20
Status published
Products (1)
chilkat_software/chilkat_xml_activex_control < 3.0.3.0
Published Sep 30, 2008
Tracked Since Feb 18, 2026