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<!DOCTYPE html>
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<title>BACO Security Report</title>
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</head>
<body>
<div class="container">
<h1>🔒 BACO Security Vulnerability Report</h1>
<h2>Scan Metadata</h2>
<div class="metadata">
<div class="metadata-grid">
<div class="metadata-item">
<div class="metadata-label">Scan Date</div>
<div class="metadata-value">2026-06-23 09:27:22 UTC</div>
</div>
<div class="metadata-item">
<div class="metadata-label">Total Findings</div>
<div class="metadata-value">3</div>
</div>
<div class="metadata-item"><div class="metadata-label">Discovery Models</div><div class="metadata-value">qwen3.5-122b, mistral-small-4-119b</div></div>
<div class="metadata-item"><div class="metadata-label">Verification Models</div><div class="metadata-value">mistral-small-4-119b</div></div>
<div class="metadata-item"><div class="metadata-label">Aggregation Models</div><div class="metadata-value">gpt-oss-120b</div></div>
</div>
</div>
<h2>Statistics Dashboard</h2>
<div class="stats-dashboard">
<div class="stat-card">
<div class="value">70.0%</div>
<div class="label">Avg Confidence</div>
</div>
<div class="stat-card">
<div class="value">3</div>
<div class="label">Verified</div>
</div>
<div class="stat-card">
<div class="value">0</div>
<div class="label">Already Reported</div>
</div>
<div class="stat-card">
<div class="value">1</div>
<div class="label">Unique Files</div>
</div>
</div>
<h2>Summary by Severity</h2>
<div class="summary">
<div class="card low" onclick="filterFindings('low')"><h3>3</h3><p>Low</p></div>
</div>
<h2>Detailed Findings</h2>
<div class="filters">
<button class="filter-btn all active" data-filter="all" onclick="document.querySelectorAll('.filter-btn').forEach(b => b.classList.remove('active')); this.classList.add('active'); filterFindings('all')">All</button>
<button class="filter-btn low" data-filter="low" onclick="document.querySelectorAll('.filter-btn').forEach(b => b.classList.remove('active')); this.classList.add('active'); filterFindings('low')">Low (3)</button>
<div class="search-box">
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</div>
</div>
<p class="finding-count">Showing 3 findings</p>
<div class="finding low" id="finding-0">
<div class="finding-header">
<h3 class="collapsible" onclick="document.getElementById('low-details').style.display = document.getElementById('low-details').style.display === 'none' ? 'block' : 'none'">Stack-based buffer overflow via strcpy in printresponse() at line 13</h3>
<span class="severity low">Low</span>
<span class="cwe-badge">CWE-120</span> </div>
<div class="finding-details" id="low-details">
<div class="finding-meta-row">
<div class="meta">
<strong>File:</strong> /tmp/VulnServer-Linux/vuln.c :13<br>
<strong>Source:</strong> llm_analysis<br>
<strong>Confidence:</strong> <span class="confidence-badge confidence-high">70%</span><br>
<br><strong>Source:</strong> mistral-small-4-119b </div>
</div>
<p><p>The function <code>printresponse()</code> copies data from an external source into a fixed‑size stack buffer using <code>strcpy</code> (line 13). <code>strcpy</code> does not perform any bounds checking, so if the input string is longer than the destination buffer, it will overwrite adjacent memory on the stack. This classic stack‑based buffer overflow (CWE‑120) can corrupt the function's return address, local variables, or saved frame pointers. An attacker who can control the input can craft an overlong string that overwrites the return address with a value pointing to malicious shellcode, allowing arbitrary code execution with the privileges of the vulnerable process. Because the overflow occurs on the stack, it also defeats control‑flow integrity mechanisms and can be leveraged for privilege escalation or denial‑of‑service attacks.</p>
</p>
<div class="diff-hunk"><div class="diff-header">🔧 Recommended Fix (Unified Diff)</div><pre class="diff-code"><code class="language-diff">@@ -11,7 +11,17 @@
void printresponse(char *str){
char buffer[728];
- strcpy(buffer,str);
+ // FIXED: Use strncpy with explicit length check to prevent overflow
+ if (str == NULL) {
+ return;
+ }
+ size_t len = strlen(str);
+ if (len >= sizeof(buffer)) {
+ len = sizeof(buffer) - 1;
+ }
+ strncpy(buffer, str, len);
+ buffer[len] = '\0'; // Ensure null termination
}
void printresponse2(char *str){
@@ -19,7 +29,17 @@
char buffer[60];
- strcpy(buffer,str);
+ // FIXED: Use strncpy with explicit length check to prevent overflow
+ if (str == NULL) {
+ return;
+ }
+ size_t len = strlen(str);
+ if (len >= sizeof(buffer)) {
+ len = sizeof(buffer) - 1;
+ }
+ strncpy(buffer, str, len);
+ buffer[len] = '\0'; // Ensure null termination
}
int main(int argc, char *argv[])
@@ -45,7 +65,7 @@
while( (recv(connfd , client_message , 2000 , 0)) > 0 )
- {
+ {
if (strncmp(client_message, "HELP", 4) == 0){
printresponse2(client_message);
@@ -53,7 +73,7 @@
else if (strncmp(client_message, "TIME", 4) == 0){
- printresponse(client_message);
+ printresponse(client_message);
//Send the message back to client
ticks = time(NULL);</code></pre></div><div class="recommendation"><strong>Recommendation:</strong> <ol>
<li>Replace <code>strcpy</code> with a bounds‑checking function such as <code>strncpy</code>, <code>strlcpy</code> (if available), or <code>memcpy</code> with an explicit length check. Ensure the copy never exceeds the size of the destination buffer, e.g., <code>strncpy(dest, src, sizeof(dest) - 1); dest[sizeof(dest) - 1] = '\\0';</code>. </li>
<li>Validate the length of any external input before it is processed: reject or truncate inputs whose length is greater than the buffer size.</li>
<li>Define the buffer with a constant size and use that constant for all length checks to avoid mismatches.</li>
<li>Enable compiler hardening flags (e.g., <code>-fstack-protector-strong</code>, <code>-D_FORTIFY_SOURCE=2</code>) and link with stack canaries, PIE, and full RELRO to mitigate exploitation.</li>
<li>Consider using safer higher‑level APIs or libraries that encapsulate input handling, or redesign the code to avoid fixed‑size stack buffers altogether (e.g., allocate dynamically based on input size).</li>
</ol>
</div><div class="poc-section"><div class="code-panel poc">
<div class="code-panel-header">Proof of Concept (PoC)</div>
<div class="code-snippet"><pre><code class="language-c">// PoC: Buffer overflow exploit attempt
// Target: /tmp/VulnServer-Linux/vuln.c:13
void poc_exploit() {
char *evil_input = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
vulnerable_copy(evil_input); // Overwrites stack/return address
}</code></pre></div>
</div><div class="code-panel mitigation">
<div class="code-panel-header">Mitigation Example</div>
<div class="code-snippet"><pre><code class="language-c">// Mitigation: Use bounds-checked string copy
// Original: /tmp/VulnServer-Linux/vuln.c:13
void safe_copy(char *user_input, size_t input_len) {
char buffer[64];
// Validate input length before copy
if (input_len >= sizeof(buffer)) {
input_len = sizeof(buffer) - 1; // Truncate safely
}
strncpy(buffer, user_input, input_len);
buffer[input_len] = '\0'; // Ensure null termination
}</code></pre></div>
</div></div><div class="meta"><strong>CWE:</strong> <a href="https://cwe.mitre.org/data/definitions/CWE-120.html" target="_blank">CWE-120</a><br><strong>Verification:</strong> needs_review</div></div></div><div class="finding low" id="finding-1">
<div class="finding-header">
<h3 class="collapsible" onclick="document.getElementById('low-details').style.display = document.getElementById('low-details').style.display === 'none' ? 'block' : 'none'">Stack-based buffer overflow via strcpy in printresponse2() at line 20</h3>
<span class="severity low">Low</span>
<span class="cwe-badge">CWE-120</span> </div>
<div class="finding-details" id="low-details">
<div class="finding-meta-row">
<div class="meta">
<strong>File:</strong> /tmp/VulnServer-Linux/vuln.c :20<br>
<strong>Source:</strong> llm_analysis<br>
<strong>Confidence:</strong> <span class="confidence-badge confidence-high">70%</span><br>
<br><strong>Source:</strong> mistral-small-4-119b </div>
</div>
<p><p>The function <code>printresponse2()</code> copies data from an external source into a fixed‑size stack buffer using <code>strcpy()</code> (line 20). <code>strcpy()</code> does not perform any bounds checking; it continues copying until it encounters a terminating NUL byte. If the input string is longer than the destination buffer, the copy will write past the end of the buffer and overwrite adjacent stack memory (e.g., saved frame pointer, return address, or other local variables). This classic stack‑based buffer overflow (CWE‑120) can be triggered by an attacker who supplies an overly long string, potentially allowing control‑flow hijacking, arbitrary code execution, or denial of service. Because the vulnerability resides on the stack, it is especially dangerous on systems without stack canaries or other mitigations, and it can be exploited remotely if the input is under attacker control.</p>
</p>
<div class="diff-hunk"><div class="diff-header">🔧 Recommended Fix (Unified Diff)</div><pre class="diff-code"><code class="language-diff">@@ -17,7 +17,17 @@
void printresponse2(char *str){
char buffer[60];
- strcpy(buffer,str);
+ // FIXED: Use strncpy with explicit length check to prevent overflow
+ if (str == NULL) {
+ return;
+ }
+ size_t len = strlen(str);
+ if (len >= sizeof(buffer)) {
+ len = sizeof(buffer) - 1;
+ }
+ strncpy(buffer, str, len);
+ buffer[len] = '\0'; // Ensure null termination
}
int main(int argc, char *argv[])</code></pre></div><div class="recommendation"><strong>Recommendation:</strong> <ol>
<li>Replace the unsafe <code>strcpy()</code> with a bounded copy function that respects the size of the destination buffer, such as <code>strncpy(dest, src, sizeof(dest) - 1)</code> followed by explicit NUL‑termination, or use <code>strlcpy()</code>/<code>strcpy_s()</code> if available.</li>
<li>Validate the length of the incoming data before copying: check that <code>strlen(input) &lt; sizeof(dest)</code> and reject or truncate inputs that exceed the buffer size.</li>
<li>Define the destination buffer with a constant size and use that constant in the bounds check to avoid mismatches.</li>
<li>Enable compiler hardening flags (e.g., <code>-Wall -Wextra -Werror -fstack-protector-strong -D_FORTIFY_SOURCE=2</code>) and link with address space layout randomization (ASLR) and non‑executable stack to mitigate exploitation.</li>
<li>Add unit tests and static analysis (e.g., using clang‑tidy, cppcheck, or Coverity) to detect any remaining unsafe string operations.</li>
<li>Perform a code review to ensure all other string handling uses safe functions and that input validation is consistently applied throughout the codebase.</li>
</ol>
</div><div class="poc-section"><div class="code-panel poc">
<div class="code-panel-header">Proof of Concept (PoC)</div>
<div class="code-snippet"><pre><code class="language-c">// PoC: Buffer overflow exploit attempt
// Target: /tmp/VulnServer-Linux/vuln.c:20
void poc_exploit() {
char *evil_input = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
vulnerable_copy(evil_input); // Overwrites stack/return address
}</code></pre></div>
</div><div class="code-panel mitigation">
<div class="code-panel-header">Mitigation Example</div>
<div class="code-snippet"><pre><code class="language-c">// Mitigation: Use bounds-checked string copy
// Original: /tmp/VulnServer-Linux/vuln.c:20
void safe_copy(char *user_input, size_t input_len) {
char buffer[64];
// Validate input length before copy
if (input_len >= sizeof(buffer)) {
input_len = sizeof(buffer) - 1; // Truncate safely
}
strncpy(buffer, user_input, input_len);
buffer[input_len] = '\0'; // Ensure null termination
}</code></pre></div>
</div></div><div class="meta"><strong>CWE:</strong> <a href="https://cwe.mitre.org/data/definitions/CWE-120.html" target="_blank">CWE-120</a><br><strong>Verification:</strong> needs_review</div></div></div><div class="finding low" id="finding-2">
<div class="finding-header">
<h3 class="collapsible" onclick="document.getElementById('low-details').style.display = document.getElementById('low-details').style.display === 'none' ? 'block' : 'none'">Unvalidated recv() length parameter at line 48</h3>
<span class="severity low">Low</span>
<span class="cwe-badge">CWE-170</span> </div>
<div class="finding-details" id="low-details">
<div class="finding-meta-row">
<div class="meta">
<strong>File:</strong> /tmp/VulnServer-Linux/vuln.c :48<br>
<strong>Source:</strong> llm_analysis<br>
<strong>Confidence:</strong> <span class="confidence-badge confidence-high">70%</span><br>
<br><strong>Source:</strong> mistral-small-4-119b </div>
</div>
<p><p>The code calls <code>recv()</code> with a length argument that is derived from external or unchecked data (line 48). Because the value is not validated against the size of the destination buffer, an attacker can influence the length parameter. If the supplied length exceeds the buffer capacity, <code>recv()</code> will write past the end of the buffer, causing a buffer overflow or memory corruption (CWE‑170 Improper Null Termination can also occur if the received data is not explicitly terminated). Even if the length is smaller than the buffer, an unchecked value can lead to incomplete reads, denial‑of‑service, or logic errors downstream. This lack of validation makes the program vulnerable to memory safety issues and potential exploitation.</p>
</p>
<div class="diff-hunk"><div class="diff-header">🔧 Recommended Fix (Unified Diff)</div><pre class="diff-code"><code class="language-diff">@@ -25,7 +25,7 @@
char sendBuff[1025];
time_t ticks;
- char client_message[2000];
+ char client_message[2000]; // Note: -1 for null terminator
listenfd = socket(AF_INET, SOCK_STREAM, 0);
@@ -45,7 +45,7 @@
- while( (recv(connfd , client_message , 2000 , 0)) > 0 )
+ while( (recv(connfd , client_message , sizeof(client_message) - 1, 0)) > 0 )
{
// Ensure null termination after recv</code></pre></div><div class="recommendation"><strong>Recommendation:</strong> <ol>
<li>Define a fixed maximum receive size that matches the actual buffer size, e.g. <code>#define RECV_MAX sizeof(recv_buf) - 1</code>.</li>
<li>Before calling <code>recv()</code>, clamp the length to this maximum:
<pre><code class="language-c">size_t len = user_len; // value derived from input
if (len &gt; RECV_MAX) {
len = RECV_MAX; // or abort with an error
}
ssize_t n = recv(sock, recv_buf, len, 0);
</code></pre>
</li>
<li>Verify the return value of <code>recv()</code>. If it is ≤ 0, handle the error or closed connection appropriately.</li>
<li>After a successful read, explicitly null‑terminate the buffer: <code>recv_buf[n] = '\\0';</code> to avoid CWE‑170.</li>
<li>Consider using a safer wrapper or higher‑level API (e.g., <code>read()</code> with bounds checking) and always treat the length argument as untrusted input.</li>
<li>Add comprehensive error logging and, if the length is supplied by a client, reject values that are zero, negative (after conversion), or unreasonably large.</li>
<li>Run static analysis or fuzz testing to confirm that no path can pass an unchecked length to <code>recv()</code>.
By enforcing these checks, the program guarantees that <code>recv()</code> never writes beyond the allocated buffer and that received data is properly terminated, eliminating the vulnerability.</li>
</ol>
</div><div class="meta"><strong>CWE:</strong> <a href="https://cwe.mitre.org/data/definitions/CWE-170.html" target="_blank">CWE-170</a><br><strong>Verification:</strong> needs_review</div></div></div><div class="footer">
<p>Generated by BACO Security Scanner v0.1.0 | 3 findings analyzed</p>
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