Thousands of Citrix Servers Still Unpatched for Critical Vulnerabilities
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2022-27510 | Unauthorized access to Gateway user capabilities Unauthorized access to Gateway user capabilities NVD description · AI analysis pending | 9.8 | 1% |
| — | ||
| CVE-2022-27518 | Unauthenticated RCE/Authentication Bypass in Citrix ADC and Gateway CVE-2022-27518 is a critical flaw in Citrix Application Delivery Controller (ADC) and Gateway firmware that permits unauthenticated remote arbitrary code execution, which CISA characterizes as an authentication bypass. It is triggered remotely over the network with no credentials, privileges, or user interaction required (CVSS 3.1: AV:N/AC:L/PR:N/UI:N, score 9.8), so any affected appliance with an internet-reachable interface is a potential target. A successful attacker gains code execution on the appliance and access to sensitive resources, which is especially dangerous on VPN gateway and load-balancing deployments that front-door enterprise networks. All organizations running Citrix ADC or Gateway appliances are potentially affected, with internet-exposed devices at greatest risk. The flaw is being actively exploited in the wild, including by state-sponsored actors; it was added to CISA KEV on 2022-12-13 and Citrix and the NSA publicly urged admins to patch, though no public proof-of-concept is known. Do: Apply the fixed firmware updates per Citrix's vendor instructions immediately, prioritizing internet-facing ADC and Gateway appliances, since the flaw is in CISA KEV and actively exploited by state-sponsored actors. Until patched, restrict or shield appliance interfaces where feasible, and review internet-exposed devices for indicators of compromise given the absence of a public PoC. | 9.8 | 7% | KEV |
| largetens of thousands of internet-exposed ADC/Gateway appliances, with thousands reported still unpatched after disclosure |
Full article306 words · extracted from thehackernews.com · click to collapse
Ravie LakshmananDec 29, 2022Server Security / Citrix
Thousands of Citrix Application Delivery Controller (ADC) and Gateway endpoints remain vulnerable to two critical security flaws disclosed by the company over the last few months.
The issues in question are CVE-2022-27510 and CVE-2022-27518 (CVSS scores: 9.8), which were addressed by the virtualization services provider on November 8 and December 13, 2022, respectively.
While CVE-2022-27510 relates to an authentication bypass that could be exploited to gain unauthorized access to Gateway user capabilities, CVE-2022-27518 concerns a remote code execution bug that could enable the takeover of affected systems.
Citrix and the U.S. National Security Agency (NSA), earlier this month, warned that CVE-2022-27518 is being actively exploited in the wild by threat actors, including the China-linked APT5 state-sponsored group.
Now, according to a new analysis from NCC Group's Fox-IT research team, thousands of internet-facing Citrix servers are still unpatched, making them an attractive target for hacking crews.
This includes over 3,500 Citrix ADC and Gateway servers running version 12.1-65.21 that are susceptible to CVE-2022-27518, as well as more than 500 servers running 12.1-63.22 that are vulnerable to both flaws.
A majority of the servers, amounting to no less than 5,000, are running 13.0-88.14, a version that's immune to CVE-2022-27510 and CVE-2022-27518.
A country-wise breakdown shows that more than 40% of servers located in Denmark, the Netherlands, Austria, Germany, France, Singapore, Australia, the U.K., and the U.S. have been updated, with China faring the worst, where only 20% of nearly 550 servers have been patched.
Fox-IT said it was able to deduce the version information from an MD5-like hash value present in the HTTP response of the login URL (i.e., "ns_gui/vpn/index.html") and mapping it to their respective versions.
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Text extracted automatically; images, tables and formatting may be missing. Original: https://thehackernews.com/2022/12/thousands-of-citrix-servers-still.html