Threat Actors Exploiting Log4j vulnerabilities propagated via SolarWinds Serv-U software

The cybersecurity researchers at Microsoft have recently identified a security flaw in SolarWinds Serv-U software that is exploited by the hackers to execute Log4j attacks to compromise the network of their victims.

While monitoring attacks using Log4j, the Microsoft expert, Jonathan Bar discovered this vulnerability which is tracked as “CVE-2021-35247.” However, SolarWinds has already fixed this vulnerability in Serv-U software in 15.3.

Flaw profile

  • Advisory ID: CVE-2021-35247
  • Description: Improper Input Validation Vulnerability in Serv-U.
  • First Published: 01/18/2022
  • Last Updated: 01/18/2022
  • Fixed Version: Serv-U 15.3
  • CVSS Score: CVSS:3.0/AV:N/AC:L/PR:N/UI:R
  • /S:C/C:N/I:L/A:N

This vulnerability is an input validation bug that enables a hacker to create a query and send the query over the network in an unverified form.

The Serv-U web login for LDAP authentication allows the attackers to use the characters that were not properly sanitized. While SolarWinds has already updated the input engine, adding an additional input validation and sanitization routine.

The LDAP servers ignore the invalid characters, which doesn’t come under the further development of the attack could occur. 

And that’s why it is not yet clear whether the threat actors tried to exploit the vulnerability and failed, or whether the attacks successfully continued by exploiting problems in Log4j.

But, since the LDAP servers ignored improper characters, so, till now there is no downstream effect has been detected yet.

You can follow us on LinkedinTwitterFacebook for daily Cybersecurity updates

Gurubaran

Gurubaran is a co-founder of Cyber Security News and GBHackers On Security. He has 10+ years of experience as a Security Consultant, Editor, and Analyst in cybersecurity, technology, and communications.

Recent Posts

Beware! Weaponized Job Recruitment Emails Spreading BeaverTail and Tropidoor Malware

A concerning malware campaign was disclosed by the AhnLab Security Intelligence Center (ASEC), revealing how…

3 hours ago

EncryptHub Ransomware Uncovered Through ChatGPT Use and OPSEC Failures

EncryptHub, a rapidly evolving cybercriminal entity, has come under intense scrutiny following revelations of operational…

3 hours ago

PoisonSeed Targets CRM and Bulk Email Providers in New Supply Chain Phishing Attack

A sophisticated phishing campaign, dubbed "PoisonSeed," has been identified targeting customer relationship management (CRM) and…

3 hours ago

Beware! Fake Unpaid Tolls Messages Used in Phishing Attack to Steal Login Credentials

A surge in phishing text messages claiming unpaid tolls has been linked to a massive…

4 hours ago

State Bar of Texas Confirms Data Breach, Begins Notifying Affected Consumers

The State Bar of Texas has confirmed a data breach following the detection of unauthorized…

4 hours ago

Hackers Use URL Shorteners and QR Codes in Tax-Themed Phishing Attacks

As the United States approaches Tax Day on April 15, cybersecurity experts have uncovered a…

4 hours ago