How CVE-2025-29911 Works
The vulnerability occurs in CryptoLib’s `Crypto_AOS_ProcessSecurity` function when processing AOS frames under SDLS-EP protocol. The function fails to validate the input frame length (len_ingest) against the maximum frame size (max_frame_size) before accessing memory locations. Specifically, it attempts to read the Frame Error Control Field (FECF) at offsets `max_frame_size – 2` and `max_frame_size – 1` without proper bounds checking. When a malicious frame with insufficient length is processed, the function reads beyond the allocated heap buffer boundaries, causing memory corruption. This can crash the cFS application (DoS) or, with careful manipulation, allow arbitrary code execution by overwriting critical memory structures.
DailyCVE Form
Platform: CryptoLib
Version: <=1.3.3
Vulnerability: Heap overflow
Severity: Critical
Date: 2025-03-17
What Undercode Say:
Exploitation Analysis:
1. Craft malicious AOS frame with small `len_ingest`
2. Set FECF field to trigger overflow
3. Target spacecraft-ground comms
4. Heap grooming possible for RCE
Protection Commands:
Temporary mitigation:
sudo iptables -A INPUT -p udp --dport <cFS_port> -m length ! --length <min_frame_size>:<max_frame_size> -j DROP
Verification script:
check_cryptolib_version() {
strings /path/to/libcrypto.so | grep -q "CRYPTOLIB_VERSION_1.3.[0-3]"
[ $? -eq 0 ] && echo "Vulnerable" || echo "Patched"
}
Code Patch Example:
// Fixed Crypto_AOS_ProcessSecurity snippet
if (len_ingest < current_managed_parameters_struct.max_frame_size) {
return CRYPTO_AOS_SECURITY_ERROR;
}
Memory Protection:
Enable ASLR system-wide echo 2 | sudo tee /proc/sys/kernel/randomize_va_space Compile-time protections: gcc -fstack-protector-strong -D_FORTIFY_SOURCE=2 -O2 ...
Detection Signatures:
YARA rule for vulnerable versions
rule CryptoLib_CVE_2025_29911 {
strings:
$sig = "CRYPTOLIB_VERSION_1.3.[0-3]"
condition:
$sig
}
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
