Asterisk Format String Vulnerabilities

vendor:

Asterisk PBX

by:

kfinisterre[at]secnetops[dot]com

7.5

CVSS

HIGH

Format String Vulnerabilities

Not mentioned

CWE

Product Name: Asterisk PBX

Affected Version From: 0.7.0

Affected Version To: 2000.7.2

Patch Exists: NO

Related CWE: Not mentioned

CPE: Not mentioned

Metasploit:

Other Scripts:

Platforms Tested: Linux

Not mentioned

Asterisk Format String Vulnerabilities

Asterisk is susceptible to format string vulnerabilities in its logging functions. An attacker may use these vulnerabilities to corrupt memory, and read or write arbitrary memory. Remote code execution is likely possible. Due to the nature of these vulnerabilities, there may exist many different avenues of attack. Anything that can potentially call the logging functions with user-supplied data is vulnerable.

Mitigation:

Patch or upgrade to a non-vulnerable version.

Source

Exploit-DB raw data:

<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="stylesheet" href="https://cdn.sucuri.net/sucuri-firewall-block.css" />
<section class="center clearfix">
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Sucuri WebSite Firewall - Access Denied</title>
<link href="https://fonts.googleapis.com/css?family=Open+Sans:400,300,600,700" rel="stylesheet" type="text/css">
</head>
<body>
<div id="main-container">
<header class="app-header clearfix">
<div class="wrap">
<a href="https://www.sucuri.net/?utm_source=firewall_block" class="logo"></a>
<span class="logo-neartext">Website Firewall</span>
<a href="https://sucuri.net/?utm_source=firewall_block" class="site-link">Back to sucuri.net</a>
</div>
</header>

<section class="app-content clearfix">
<div class="box">
<p class="medium-text">This page you are trying to visit is protected by an automated security check. Please complete the check below to verify your browser and proceed.</p>

<style>
.cap-spin{width:20px;height:20px;border:2px solid #d7ede0;border-top-color:#2e7d32;border-radius:50%;display:inline-block;animation:capspin .7s linear infinite;}
@keyframes capspin{to{transform:rotate(360deg);}}
#cap-widget:focus{outline:2px solid #b9c7ff;outline-offset:2px;}
</style>
<script>
var _cs="2363c4e6c164769590fe962f94d48fcb";
var _cd=4;
var _ce=1786450046;
var _cg="d28554af91478c42e161d11bad0537bcf191bc6a03bf695424e124d7408316e3";
var _capBusy=false;
function _hex(b){return Array.from(new Uint8Array(b)).map(function(x){return x.toString(16).padStart(2,'0');}).join('');}
async function _sha(s){return _hex(await crypto.subtle.digest('SHA-256',new TextEncoder().encode(s)));}
function _capState(s){var i=document.getElementById('cap-ind'),l=document.getElementById('cap-label'),w=document.getElementById('cap-widget');if(s==='verifying'){i.innerHTML='<span class="cap-spin"></span>';l.textContent='Verifying...';w.style.cursor='default';}else if(s==='done'){i.innerHTML='<svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="#2e7d32" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"><polyline points="20 6 9 17 4 11"></polyline></svg>';l.textContent="You're a human";w.style.cursor='default';w.setAttribute('aria-checked','true');}}
async function capSolve(){if(_capBusy)return;_capBusy=true;_capState('verifying');var _t0=Date.now();var p=Array(_cd+1).join('0');var n=0;while(true){var h=await _sha(_cs+n);if(h.slice(0,_cd)===p){break;}n++;}document.getElementById('cap-token').value=_cs+':'+_cd+':'+_ce+':'+_cg+':'+n;var _w=800-(Date.now()-_t0);if(_w<0)_w=0;setTimeout(function(){_capState('done');var b=document.getElementById('cap-proceed');if(b){b.disabled=false;b.style.opacity='1';b.style.cursor='pointer';b.focus();}},_w);}
</script>
</br></br>
<form method="post" id="captchaform">
<input type="hidden" name="cap-token" id="cap-token" value="" />
<div id="cap-widget" role="checkbox" aria-checked="false" tabindex="0" onclick="capSolve()" onkeydown="if(event.key==='Enter'||event.key===' '){event.preventDefault();capSolve();}" style="display:inline-flex;align-items:center;gap:12px;background:#fff;border:1px solid #d3d3d3;border-radius:8px;padding:14px 18px;min-width:260px;cursor:pointer;box-shadow:0 1px 2px rgba(0,0,0,0.08);text-align:left;">
<span id="cap-ind" style="width:24px;height:24px;flex:0 0 24px;display:inline-flex;align-items:center;justify-content:center;"><span style="width:22px;height:22px;border:2px solid #c2c2c2;border-radius:4px;box-sizing:border-box;display:inline-block;"></span></span>
<span id="cap-label" style="flex:1;font-size:15px;color:#333;">Verify you&#39;re human</span>
</div>
<div><button type="submit" id="cap-proceed" class="btn btn-primary ajax-form brand-font" disabled style="margin-top:16px;opacity:.5;cursor:not-allowed;">Click to Proceed to Page</button></div>
</form>
</br></br>
<p class="what-is-firewall">
<a href="https://sucuri.net/website-firewall/?utm_source=firewall_block">Sucuri Website Firewall</a> is a cloud-based protection that
stands between your site and the rest of the world and protects against attacks,
malware infections, DDOS, brute force attempts and mostly anything that can harm it.</p>
</div>
</section>

<footer>
<span>&copy; 2026 Sucuri Inc. All rights reserved.</span>
<span id="privacy-policy"><a href="https://sucuri.net/privacy-policy?utm_source=firewall_block" target="_blank" rel="nofollow noopener">Privacy</a></span>
</footer>
</div>
</body>
</html>