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How the CVE works: The vulnerability is an out-of-bounds write in the PCX image codec within QNX SDP versions 8.0, 7.1, and 7.0. When processing a PCX image file, the codec fails to validate input data from the file header, such as image dimensions or palette size. This leads to incorrect buffer size calculations, allowing data to be written beyond the allocated memory boundary. An attacker can craft a malicious PCX file with manipulated values to trigger this write, corrupting adjacent memory structures. Depending on the controlled data and memory layout, this corruption can cause a process crash (denial-of-service) or overwrite critical pointers like function addresses. By hijacking the instruction pointer, an attacker may execute arbitrary code within the context of the process using the codec. The vulnerability is exploitable by unauthenticated attackers through file upload or network services that decode PCX images, posing significant risk in embedded systems where QNX is commonly deployed.
Platform: QNX SDP
Version: 8.0 7.1 7.0
Vulnerability: Out-of-bounds write
Severity: Critical
Date: 06/10/2025
Prediction: Patch expected Q4 2025
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Showing bash commands and codes related to the blog
file exploit.pcx
xxd exploit.pcx | head -5
strings exploit.pcx | grep -i pcx
qnx-version | grep SDP
objdump -d libcodec.so | grep bounds
How Exploit:
Craft malicious PCX header.
Control out-of-bounds write offset.
Overwrite function pointer with shellcode.
Execute code via decoded image.
Protection from this CVE:
Apply vendor patches.
Disable PCX processing.
Use memory sanitizers.
Enable ASLR DEP.
Impact:
Denial-of-service crashes.
Arbitrary code execution.
System compromise potential.
Privilege escalation risk.
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Sources:
Reported By: nvd.nist.gov
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