Exploitation attempts targeting a remote code execution flaw in Citrix’s ShareFile product have spiked just as the US Cybersecurity and Infrastructure Security Agency (CISA) added it to its Known Exploited Vulnerabilities Catalog.
The vulnerability affecting the ShareFile file sharing and collaboration product is tracked as CVE-2023-24489 and it has been assigned a ‘critical’ severity rating. It can allow an unauthenticated attacker to upload arbitrary files and possibly achieve remote code execution.
When details of the security hole were disclosed by Assetnote in early July — Assetnote researchers discovered the flaw — the company warned that there had been between 1,000 and 6,000 internet-exposed ShareFile instances.
Citrix announced the availability of patches for CVE-2023-24489 on June 13 and exploitation started in late July, with threat intelligence firm GreyNoise seeing attack attempts coming from a handful of IP addresses.
CISA added CVE-2023-24489 to its Known Exploited Vulnerabilities Catalog on Wednesday, instructing government organizations to address it by September 6. On the same day, GreyNoise reported seeing a “huge spike” in exploitation attempts, coming from 72 unique IPs.
It’s worth noting that GreyNoise has not recorded any other attacks between late July and now.
It’s unclear what the attackers are trying to achieve, but Citrix vulnerabilities have been known to be exploited by both financially motivated cybercriminals and state-sponsored threat actors.
News of a spike in CVE-2023-24489 exploitation comes just days after NCC Group reported seeing 2,000 Citrix NetScaler instances that had been backdoored following exploitation of a recent vulnerability tracked as CVE-2023-3519. The flaw has been exploited since at least June, including against critical infrastructure organizations, when it still had a zero-day status.
Related: Over 20,000 Citrix Appliances Vulnerable to New Exploit
Eduard Kovacs (@EduardKovacs) is a managing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.
More from Eduard Kovacs
- CISA Warns of Old JBoss RichFaces Vulnerability Being Exploited in Attacks
- NIST Publishes Final Version of 800-82r3 OT Security Guide
- Johnson Controls Hit by Ransomware
- Verisoul Raises $3.25 Million in Seed Funding to Detect Fake Users
- Government Shutdown Could Bench 80% of CISA Staff
- Google Rushes to Patch New Zero-Day Exploited by Spyware Vendor
- macOS 14 Sonoma Patches 60 Vulnerabilities
- New GPU Side-Channel Attack Allows Malicious Websites to Steal Data
Latest News
- Bankrupt IronNet Shuts Down Operations
- AWS Using MadPot Decoy System to Disrupt APTs, Botnets
- Generative AI Startup Nexusflow Raises $10.6 Million
- In Other News: RSA Encryption Attack, Meta AI Privacy, ShinyHunters Hacker Guilty Plea
- Researchers Extract Sounds From Still Images on Smartphone Cameras
- National Security Agency is Starting an Artificial Intelligence Security Center
- CISA Warns of Old JBoss RichFaces Vulnerability Being Exploited in Attacks
- Hackers Set Sights on Apache NiFi Flaw That Exposes Many Organizations to Attacks
