Connect with us

Hi, what are you looking for?

SecurityWeekSecurityWeek

Vulnerabilities

Recent Juniper Flaws Chained in Attacks Following PoC Exploit Publication

Four recent vulnerabilities in the J-Web component of Junos OS have started being chained in malicious attacks after PoC exploit code was published.

Threat actors have started exploiting four recently patched vulnerabilities in the J-Web component of Juniper Networks’ Junos OS after proof-of-concept (PoC) exploit code was published online.

The issues, tracked as CVE-2023-36844 through CVE-2023-36847, are medium-severity bugs that can be exploited to control environment variables remotely and to upload arbitrary files, without authentication.

Juniper Networks released patches for these vulnerabilities ten days ago, warning that an attacker could chain them to achieve remote code execution and rating the chained exploitation as ‘critical severity’.

The bugs, the networking appliances maker says, impact the SRX series firewalls and EX series switches running Junos OS versions prior to 20.4R3-S8, 21.2R3-S6, 21.3R3-S5, 21.4R3-S4, 22.1R3-S3, 22.2R3-S1, 22.3R2-S2, 22.3R3, 22.4R2-S1, 22.4R3, and 23.2R1.

According to non-profit cybersecurity organization Shadowserver Foundation, exploitation of these vulnerabilities started on August 25, the same day that PoC exploit code was published.

“Since 25th August we are seeing exploitation attempts from multiple IPs for Juniper J-Web CVE-2023-36844 (& friends) targeting /webauth_operation.php endpoint. Same day an exploit POC was published. This involves combining lower severity CVEs to achieve pre-auth RCE,” Shadowserver says.

Shadowserver tracks roughly 8,200 instances of exposed J-Web interfaces, most of them located in Asia (5,170), followed by North America (1,292) and Europe (1,018). It has observed more than 3,300 events related to the exploitation of these flaws.

Advertisement. Scroll to continue reading.

The attacks appear to be related to the PoC exploit that attack surface management firm WatchTowr published on August 25 alongside a technical analysis of two of these vulnerabilities – namely CVE-2023-36846 and CVE-2023-36847.

Pointing out that the exploitation of these flaws is trivial, the cybersecurity firm urged administrators to update the affected firewalls and switches to the latest available firmware releases and to check the PHP log files on their appliances for specific error messages that could indicate intrusion attempts.

“Given the simplicity of exploitation, and the privileged position that JunOS devices hold in a network, we would not be surprised to see large-scale exploitation,” WatchTowr warned.

Related: Juniper Networks Patches High-Severity Vulnerabilities in Junos OS

Related: Juniper Networks Patches Critical Third-Party Component Vulnerabilities

Related: Juniper Networks Kicks Off 2023 With Patches for Over 200 Vulnerabilities

Written By

Ionut Arghire is an international correspondent for SecurityWeek.

Click to comment

Daily Briefing Newsletter

Subscribe to the SecurityWeek Email Briefing to stay informed on the latest threats, trends, and technology, along with insightful columns from industry experts.

Join security experts as they discuss ZTNA’s untapped potential to both reduce cyber risk and empower the business.

Register

Join Microsoft and Finite State for a webinar that will introduce a new strategy for securing the software supply chain.

Register

Expert Insights

Related Content

Vulnerabilities

Less than a week after announcing that it would suspended service indefinitely due to a conflict with an (at the time) unnamed security researcher...

Data Breaches

OpenAI has confirmed a ChatGPT data breach on the same day a security firm reported seeing the use of a component affected by an...

Risk Management

The supply chain threat is directly linked to attack surface management, but the supply chain must be known and understood before it can be...

IoT Security

A group of seven security researchers have discovered numerous vulnerabilities in vehicles from 16 car makers, including bugs that allowed them to control car...

Vulnerabilities

The latest Chrome update brings patches for eight vulnerabilities, including seven reported by external researchers.

Vulnerabilities

Patch Tuesday: Microsoft warns vulnerability (CVE-2023-23397) could lead to exploitation before an email is viewed in the Preview Pane.

Vulnerabilities

A researcher at IOActive discovered that home security systems from SimpliSafe are plagued by a vulnerability that allows tech savvy burglars to remotely disable...

Cybercrime

Patch Tuesday: Microsoft calls attention to a series of zero-day remote code execution attacks hitting its Office productivity suite.