A vulnerability has been found in Observium Network Monitor (version now known) and classified as critical. This vulnerability affects some unknown processing of the file /includes/rrdtool.inc.php. The manipulation with an unknown input leads to a command injection vulnerability. The CWE definition for the vulnerability is CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability.

The bug was discovered 09/01/2016. The weakness was presented 11/10/2016 by Ronald Volgers as [CT-2016-1110] Unauthenticated RCE in Observium network monitor as confirmed mailinglist post (Full-Disclosure). The advisory is shared for download at seclists.org. The public release was coordinated in cooperation with the vendor. The exploitation appears to be easy. The attack can be initiated remotely. Required for exploitation is a single authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1202. Responsible for the vulnerability is the following code:

function rrdtool_pipe_open(&$rrd_process, &$rrd_pipes)
{
 global $config;

 $command = $config['rrdtool'] . " -"; // Waits for input via standard input (STDIN)

 $descriptorspec = array(
    0 => array("pipe", "r"),  // stdin
    1 => array("pipe", "w"),  // stdout
    2 => array("pipe", "w")   // stderr
 );

 $cwd = $config['rrd_dir'];
 $env = array();

 $rrd_process = proc_open($command, $descriptorspec, $rrd_pipes, $cwd, $env);

The vulnerability was handled as a non-public zero-day exploit for at least 55 days. During that time the estimated underground price was around $0-$5k. By approaching the search of inurl:includes/rrdtool.inc.php it is possible to find vulnerable targets with Google Hacking.

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

See 93567, 93569 and 93570 for similar entries.

Productinfo

Vendor

• Observium

Name

• Network Monitor

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Discussion