Multiple Vulnerabilities in Openssh is a Medium risk vulnerability that is one of the most frequently found on networks around the world. This issue has been around since at least 1990 but has proven either difficult to detect, difficult to resolve or prone to being overlooked entirely.
| Vulnerability Name: | Openssh |
|---|---|
| Test ID: | 14035 |
| Risk: | Medium |
| Category: | SSH servers |
| Type: | Attack |
| Summary: | The remote_glob function in sftp-glob.c and the process_put function in sftp.c in OpenSSH 5.8 and earlier, as used in FreeBSD 7.3 and 8.1, NetBSD 5.0.2, OpenBSD 4.7, and other products, allow remote authenticated users to cause a denial of service (CPU and memory consumption) via crafted glob expressions that do not match any pathnames, as demonstrated by glob expressions in SSH_FXP_STAT requests to an sftp daemon, a different vulnerability than CVE-2010-2632.Other vulnerabilities may be flagged based on the version and are noted in the CVE list below. $OUTPUT |
| Impact: | Allow remote authenticated users to cause a denial of service (CPU and memory consumption). |
| Solution: | Upgrade to OpenSSH version 5.9 or newer. |
| CVE: | CVE-2010-4755, CVE-2011-4327, CVE-2011-5000, CVE-2012-0814 |
| More Information: | http://cxsecurity.com/issue/WLB-2010100135 http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2010-008.txt.asc http://www.openssh.com/txt/portable-keysign-rand-helper.adv https://bugzilla.redhat.com/show_bug.cgi?id=755640 |
| Nist NVD (CVSS): | AV:N/AC:L/Au:S/C:N/I:N/A:P |
| CVSS Score: | 4.0 |
Scanning For and Finding multiple Vulnerabilities in Openssh
Use of Vulnerability Management tools, are standard practice for the discovery of this vulnerability. The primary failure of VA in finding this vulnerability is related to setting the proper scope and frequency of network scans. It is vital that the broadest range of hosts (active IPs) possible are scanned and that scanning is done frequently. We recommend weekly. Your existing scanning solution or set of test tools should make this not just possible, but easy and affordable.
Penetration Testing (pentest) for this Vulnerability
The multiple Vulnerabilities in Openssh is prone to false positive reports by most vulnerability assessment solutions. Fortra Vulnerability Management uses behavior based testing that eliminates this issue. For all other VA tools security consultants will recommend confirmation by direct observation. In any case Penetration testing procedures for discovery of multiple Vulnerabilities in Openssh produces the highest discovery accuracy rate, but the infrequency of this expensive form of testing degrades its value. The ideal would be to have pentesting accuracy and the frequency and scope possibilities of VA solutions.
Security Updates on multiple Vulnerabilities in Openssh
Given that this is one of the most frequently found vulnerabilities, there is ample information regarding mitigation online and very good reason to get it fixed. Hackers are also aware that this is a frequently found vulnerability and so its discovery and repair is that much more important. It is so well known and common that any network that has it present and unmitigated indicates "low hanging fruit" to attackers.
Patching/Repairing this Vulnerability
multiple Vulnerabilities in Openssh is a Medium risk vulnerability that is also high frequency and high visibility. This is the most severe combination of security factors that exists and it is extremely important to find it on your network and fix it as soon as possible.
Exploits related to multiple Vulnerabilities in Openssh
- http://www.cvedetails.com/product/585/Openbsd-Openssh.html?vendor_id=97
- https://www.cvedetails.com/vulnerability-list/vendor_id-97/product_id-585/Openbsd-Openssh.html