~40,000 Attacks in 3 Days: Critical Confluence RCE Under Active Exploitation
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2023-22527 | Unauthenticated OGNL Template Injection RCE in Atlassian Confluence Data Center/Server Atlassian Confluence Data Center and Server contain an unauthenticated OGNL template injection vulnerability (CWE-74) in which attacker-controlled input is evaluated by the application as an OGNL expression. A remote, unauthenticated attacker can trigger the flaw by sending a crafted HTTP request that injects OGNL expressions, which the server then executes. Successful exploitation leads to remote code execution on the host running Confluence, giving the attacker control of the system without any credentials. Any organization running self-hosted Confluence Data Center or Server is potentially affected — the available data does not specify version ranges, so operators should consult Atlassian's advisory — with internet-facing instances at highest risk. Exploitation is active: the flaw was added to CISA's Known Exploited Vulnerabilities catalog on 2024-01-24 with known ransomware use, and EPSS assigns it a 100% probability of exploitation within 30 days (100th percentile). Do: Patch to the fixed release specified in Atlassian's advisory immediately, prioritizing internet-exposed instances, since the flaw is in CISA's KEV with known ransomware use and carries a 100% EPSS. If patching is not immediately possible, apply the vendor's mitigations per the KEV required action — or discontinue/restrict use — for example by limiting unauthenticated access to Confluence from the internet. Review Confluence access and application logs for anomalous unauthenticated requests and indicators of command execution or ransomware activity. | 9.8 | 100% | KEV ransomware PoC ×2 |
| largetens of thousands of internet-exposed Confluence instances (order of 10,000–100,000) |
Full article280 words · extracted from thehackernews.com · click to collapse
Ravie LakshmananJan 23, 2024Vulnerability / Cyber Attack
Malicious actors have begun to actively exploit a recently disclosed critical security flaw impacting Atlassian Confluence Data Center and Confluence Server, within three days of public disclosure.
Tracked as CVE-2023-22527 (CVSS score: 10.0), the vulnerability impacts out-of-date versions of the software, allowing unauthenticated attackers to achieve remote code execution on susceptible installations.
The shortcoming affects Confluence Data Center and Server 8 versions released before December 5, 2023, as well as 8.4.5.
But merely days after the flaw became public knowledge, nearly 40,000 exploitation attempts targeting CVE-2023-22527 have been recorded in the wild as early as January 19 from more than 600 unique IP addresses, according to both the Shadowserver Foundation and the DFIR Report.
The activity is currently limited "testing callback attempts and 'whoami' execution," suggesting that threat actors are opportunistically scanning for vulnerable servers for follow-on exploitation.
A majority of the attacker IP addresses are from Russia (22,674), followed by Singapore, Hong Kong, the U.S., China, India, Brazil, Taiwan, Japan, and Ecuador.
Over 11,000 Atlassian instances have been found to be accessible over the internet as of January 21, 2024, although it's currently not known how many of them are vulnerable to CVE-2023-22527.
"CVE-2023-22527 is a critical vulnerability within Atlassian's Confluence Server and Data Center," ProjectDiscovery researchers Rahul Maini and Harsh Jaiswal said in a technical analysis of the flaw.
"This vulnerability has the potential to permit unauthenticated attackers to inject OGNL expressions into the Confluence instance, thereby enabling the execution of arbitrary code and system commands."
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Text extracted automatically; images, tables and formatting may be missing. Original: https://thehackernews.com/2024/01/40000-attacks-in-3-days-critical.html