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How the mentioned CVE works:
The vulnerability resides in the PDF parsing logic of Adobe Reader and Acrobat, specifically within the handling of a malformed U3D (Universal 3D) object embedded in a PDF file. A heap-based buffer overflow occurs when the application processes a specially crafted PDF with an insufficiently validated length field. When the PDF is opened, the parser allocates a heap buffer based on a corrupted size value. A subsequent memory copy operation writes data beyond the allocated buffer boundaries, overwriting adjacent heap metadata such as chunk headers or function pointers. This overwrite corrupts critical control structures, leading to arbitrary memory write primitives. Attackers can carefully craft the overflow data to redirect execution flow to attacker-controlled shellcode. The shellcode is typically embedded within the same PDF, often using return-oriented programming (ROP) to bypass non-executable stack protections. Exploitation achieves remote code execution with the privileges of the current user. The overflow does not require any user interaction beyond opening the PDF file. In October 2009, this vulnerability was actively exploited in targeted attacks, with malicious PDFs distributed via email and web downloads. The flaw affects all versions prior to 7.1.4, 8.1.7, and 9.2. Adobe confirmed the in-the-wild exploitation and released an out-of-band bulletin. The root cause is improper bounds checking in the U3D decryption routine, where an attacker-controlled integer is used as the size for a memcpy operation. No authentication or special permissions are needed. The heap spray technique was commonly used to achieve reliable code execution across different system configurations.
DailyCVE form:
Platform: Adobe Reader/Acrobat
Version: Before 9.2
Vulnerability: Heap buffer overflow
Severity: Critical
date: October 2009
Prediction: Patch 2009-10-13
What Undercode Say:
Check installed Adobe Reader version (Linux example)
acroread -v
Detect vulnerable versions (Windows registry query)
reg query "HKLM\SOFTWARE\Adobe\Adobe Reader\9.0" /v Version
Bash one-liner to extract PDF object streams for analysis
pdf-parser -a suspicious.pdf | grep -i "U3D"
Python script to check PDF for malformed U3D length
import sys
with open(sys.argv[bash], 'rb') as f:
data = f.read()
if b'/U3D' in data:
print("Potential CVE-2009-3459 indicator - U3D object found")
How Exploit:
Craft a PDF with a U3D stream containing a manipulated length field (e.g., 0xFFFFFFFF) followed by oversized data. Heap spray with NOP sled and shellcode using JavaScript or embedded objects. Trigger overflow via a memcpy that copies attacker data past buffer end, overwriting a vtable pointer. Redirect execution to the sprayed heap region, achieving arbitrary code execution.
Protection from this CVE:
Upgrade to Adobe Reader 9.2, 8.1.7, or 7.1.4 or later. Disable JavaScript in Adobe Reader (Edit > Preferences > JavaScript). Use Protected View mode (if available). Convert PDFs to plain text before opening. Apply Microsoft EMET or similar exploit mitigation tools. Monitor for US-CERT alert TA09-286B. Use third-party PDF readers with stricter sandboxing.
Impact:
Remote code execution with user-level privileges. Full control over the affected system, allowing malware installation, data theft, persistent backdoors, and lateral movement within networks. Targeted attacks in October 2009 compromised corporate and government endpoints via spear-phishing emails containing malicious PDFs.
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Sources:
Reported By: www.cve.org
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