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How CVE-2025-26306 Works
The vulnerability resides in `libming v0.4.8` within the `readSizedString` function (util/read.c). When parsing a crafted SWF (Shockwave Flash) file, the function fails to properly deallocate memory after reading string data. This results in a memory leak, gradually consuming system resources. Attackers exploit this by submitting malicious files repeatedly, leading to denial of service (DoS) due to memory exhaustion. The flaw stems from improper handling of dynamic memory allocation without corresponding `free()` calls.
DailyCVE Form:
Platform: libming
Version: 0.4.8
Vulnerability: Memory leak
Severity: Medium
Date: 04/17/2025
What Undercode Say:
Exploitation:
1. Craft Malicious SWF:
with open("exploit.swf", "wb") as f:
f.write(b"\x46\x57\x53\x09" + b"\x41" 1000) Corrupted SWF header + oversized string
2. Trigger Parsing:
ming-bin -parse exploit.swf Repeated execution exhausts memory
Detection & Mitigation:
1. Check Memory Usage:
valgrind --leak-check=full ming-bin exploit.swf
2. Patch Application:
// util/read.c fix + free(buffer); // Add missing deallocation
3. Workaround:
ulimit -v 524288 Restrict process memory
Analysis Tools:
- GDB Debugging:
gdb --args ming-bin exploit.swf break readSizedString
- Static Analysis:
flawfinder util/read.c
References:
(Strictly 50 lines, no extra words)
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
