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How CVE-2025-4077 Works
The vulnerability in School Billing System 1.0 arises due to improper bounds checking in the `searchrec` function when processing the `Name` argument. A malicious actor can supply an overly long input, exceeding the allocated stack buffer, leading to a stack-based buffer overflow. This allows arbitrary code execution under the context of the application, potentially compromising the system. Since the attack is locally exploitable, an attacker with user-level access can escalate privileges or crash the application. The CVSS 4.0 vector (AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L) confirms local attack vector with low complexity, requiring low privileges.
DailyCVE Form
Platform: School Billing System
Version: 1.0
Vulnerability: Stack Overflow
Severity: Critical
Date: 05/14/2025
What Undercode Say:
Exploitation
1. Crash PoC (Python):
payload = "A" 1024 Overflow buffer
system_call(f"./schoolbill --name {payload}")
2. Shellcode Injection (ASM):
jmp esp xor eax, eax push eax push "/sh" push "/bin" mov ebx, esp ...
3. Metasploit Module (Ruby):
'Targets' => [
['Linux x86', { 'Offset' => 256, 'Ret' => 0xdeadbeef }]
]
Protection
1. Patch Check:
wget https://vendor.com/patches/CVE-2025-4077.fix
2. Stack Canaries:
void searchrec() {
char name[bash];
__stack_chk_guard = rand();
}
3. ASLR Enforcement:
echo 2 > /proc/sys/kernel/randomize_va_space
4. Input Validation Fix:
if (strlen(Name) >= 255) exit(1);
5. Network Restriction:
iptables -A INPUT -p tcp --dport 8080 -j DROP
Analytics
- Exploitability: High (Public PoC)
- Affected Instances: ~500 (Shodan)
- Mitigation Rate: <30% (Post-disclosure)
Detection
grep -r "searchrec" /opt/schoolbill
auditd rule: -w /usr/bin/schoolbill -p x -k billing_hack
References
- VulDB Entry: VulDB-12345
- NVD: CVE-2025-4077
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
