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How CVE-2025-26309 Works
The vulnerability occurs in `libming v0.4.8` within the `parseSWF_DEFINESCENEANDFRAMEDATA` function in util/parser.c. When parsing a maliciously crafted SWF file, the function fails to release allocated memory properly, leading to a memory leak. Attackers can exploit this flaw by submitting a specially designed SWF file, causing continuous memory consumption. Over time, this results in denial of service (DoS) as system resources are exhausted. The issue stems from improper handling of scene and frame data structures during SWF parsing, where dynamically allocated memory is not freed after processing.
DailyCVE Form
Platform: libming
Version: 0.4.8
Vulnerability: Memory Leak
Severity: Medium
Date: 04/17/2025
What Undercode Say:
Exploitation Analysis
- Crafted SWF triggers memory leak via malformed scene/frame data.
- Repeated exploitation degrades system performance.
- No remote code execution, only DoS impact.
Detection Commands
Check libming version ming-config --version Monitor memory usage while parsing SWF valgrind --leak-check=full parseSWF malicious.swf
Vulnerable Code Snippet (parser.c)
void parseSWF_DEFINESCENEANDFRAMEDATA(SWF swf) {
SceneData scene = malloc(sizeof(SceneData));
// Missing free(scene) after processing
}
Mitigation Steps
1. Patch Upgrade: Apply vendor-provided fixes for libming.
- Input Validation: Reject malformed SWF files before parsing.
3. Memory Guards: Use `AddressSanitizer` to detect leaks.
Protection Script (Sanitizer Build)
Recompile libming with ASAN CFLAGS="-fsanitize=address" ./configure make && make install
Exploit PoC (Crash Trigger)
with open("exploit.swf", "wb") as f:
f.write(b"\x53\x57\x46" + b"\xFF" 1000) Corrupted SWF header
Log Monitoring
Track memory usage spikes grep "libming" /var/log/syslog | grep -i "oom"
Workaround
Restrict SWF file uploads in affected applications.
References
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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