CVE-2025-51823
📋 TL;DR
CVE-2025-51823 is a buffer overflow vulnerability in libcsp 2.0's csp_eth_init() function that occurs when copying interface names without length validation. This allows attackers to overwrite adjacent memory, potentially leading to arbitrary code execution or denial of service. Systems using libcsp 2.0 with Ethernet functionality are affected.
💻 Affected Systems
- libcsp
📦 What is this software?
Libcsp by Libcsp
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise if the vulnerable component is exposed and exploitable.
Likely Case
Denial of service through application crashes or memory corruption, potentially disrupting network communications.
If Mitigated
Limited impact with proper input validation and memory protections like ASLR and stack canaries.
🎯 Exploit Status
Exploitation requires control over the ifname parameter passed to csp_eth_init(), which may require specific access or conditions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in libcsp version after pull request #852
Vendor Advisory: https://github.com/libcsp/libcsp/issues/850
Restart Required: No
Instructions:
1. Update libcsp to the latest version that includes the fix from pull request #852. 2. Recompile any applications using libcsp. 3. Deploy updated applications.
🔧 Temporary Workarounds
Input Validation Wrapper
allImplement input validation for ifname parameter before calling csp_eth_init()
// In code calling csp_eth_init():
if (strlen(ifname) < MAX_IFNAME_LENGTH) {
csp_eth_init(ifname, ...);
} else {
// Handle error
}
🧯 If You Can't Patch
- Disable or restrict access to Ethernet functionality in libcsp if not required.
- Implement strict input validation and length checking for all interface name parameters.
🔍 How to Verify
Check if Vulnerable:
Check if libcsp version is 2.0 and if csp_eth_init() is used in the codebase.Check Version:
Check libcsp version in build configuration or via package manager: dpkg -l | grep libcsp or rpm -qa | grep libcspVerify Fix Applied:
Verify the libcsp source code uses strncpy or similar safe functions instead of strcpy in csp_eth_init().📡 Detection & Monitoring
Log Indicators:
- Application crashes or segmentation faults related to libcsp Ethernet initialization
- Unusually long interface names in network configuration
Network Indicators:
- Unexpected network interface initialization attempts
- Malformed network packets targeting libcsp services
SIEM Query:
source="application_logs" AND ("segmentation fault" OR "buffer overflow") AND process="*libcsp*"