What We Do
How we do it
Resources
SECURITY ADVISORIES
Jul 26, 2021
PetitPotam NTLM Relay Attack
THE THREAT PetitPotam is a variant of NTLM Relay attacks discovered by security researcher Gilles Lionel. Proof of Concept code released last week [1] relies on the Encrypting File System Remote (EFSRPC) protocol to provoke a Windows host into performing an NTLM authentication request against an attacker-controlled server, exposing NTLM authentication details or authentication certificates.…
Read More
View all Advisories →
Company
ABOUT eSENTIRE
About Us
eSentire is The Authority in Managed Detection and Response Services, protecting the critical data and applications of 1000+ organizations in 70+ countries from known and unknown cyber threats. Founded in 2001, the company’s mission is to hunt, investigate and stop cyber threats before they become business disrupting events.
Read about how we got here
Leadership Work at eSentire
LATEST PRESS RELEASE
Jul 12, 2021
Tecala and eSentire Partner to Protect Enterprises across APAC from Business-Disrupting Cyber Attacks
Sydney, 12 July, 2021 - Tecala, Australia’s award-winning technology services and IT consulting provider, today announced it has chosen eSentire, the global Authority in Managed Detection and Response (MDR) cybersecurity services, as their exclusive MDR solution provider in Australia and New Zealand. This partnership will enable Tecala to augment its cybersecurity practice and offer enterprises…
Read More
Partners
PARTNER PROGRAM
Partners
Our award-winning partner program offers financial rewards, sales and marketing tools and personalized training. Accelerate your business and grow your revenue by offering our world-class Managed Detection and Response (MDR) services.
Learn about our Partner Program
Resources
Security advisories — Feb 27, 2019

Libssh Authentication Bypass

2 min read

A serious vulnerability affecting the Secure Shell implementation library, Libssh versions 0.6 and above, have been identified [1]. Exploitation of the vulnerability is trivial and allows threat actors to gain access to affected servers without any authentication. The vulnerability is being tracked as CVE-2018-10933 and is due to an authentication error in the server code which allows threat actors to change the request message. There is a high confidence rating that threat actors will quickly target this vulnerability due to the simplicity to exploit.

What we’re doing about it

What you should do about it

Additional information

Vulnerable servers expect the message SSH2_MSG_USERAUTH_REQUEST, when an unauthenticated user tries to access them. CVE-2018-10933 allows threat actors to gain unauthenticated access into affected servers by sending an SSH2_MSG_USERAUTH_SUCCESS message to a server.

The attack surface appears to be relatively small with at least 1700 potentially vulnerable servers appearing in Shodan results. Servers that are not internet facing are still potentially vulnerable and require patching.

A major initial concern was that the web-based hosting service GitHub would be affected. GitHub has confirmed that both the open GitHub and GitHub enterprises Libssh but are not affected by the breach due to server configuration [3].


References:

[1] Authentication bypass in server code CVE ID#: CVE-2018-10933
https://www.libssh.org/security/advisories/CVE-2018-10933.txt

[2] The SSH library
https://www.libssh.org/

[3] While we use libssh, we can confirm that and GitHub Enterprise are unaffected by CVE-2018-10933 due to how we use the library.
https://twitter.com/GitHubSecurity/status/1052317333379723265