Vulnerabilities > CVE-2023-3519 - Code Injection vulnerability in Citrix products
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
Unauthenticated remote code execution
Vulnerable Configurations
Part | Description | Count |
---|---|---|
Application | 8 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Leverage Executable Code in Non-Executable Files An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
- Manipulating User-Controlled Variables This attack targets user controlled variables (DEBUG=1, PHP Globals, and So Forth). An attacker can override environment variables leveraging user-supplied, untrusted query variables directly used on the application server without any data sanitization. In extreme cases, the attacker can change variables controlling the business logic of the application. For instance, in languages like PHP, a number of poorly set default configurations may allow the user to override variables.
Related news
- Citrix ADC zero-day exploitatation: CISA releases details about attack on CI organization (CVE-2023-3519) (source)
- CISA: Citrix RCE bug exploited to breach critical infrastructure org (source)
- Netscaler ADC bug exploited to breach US critical infrastructure org (source)
- Over 15K Citrix servers likely vulnerable to CVE-2023-3519 attacks (source)
- CISA warns govt agencies to patch Adobe ColdFusion servers (source)
- Over 15K Citrix servers vulnerable to CVE-2023-3519 RCE attacks (source)
- Over 640 Citrix servers backdoored with web shells in ongoing attacks (source)
- Hundreds of Citrix NetScaler ADC and Gateway Servers Hacked in Major Cyber Attack (source)
- New CVE-2023-3519 scanner detects hacked Citrix ADC, Gateway devices (source)
- Almost 2,000 Citrix NetScaler servers backdoored in hacking campaign (source)
- Nearly 2,000 Citrix NetScaler Instances Hacked via Critical Vulnerability (source)
- (Re)check your patched NetScaler ADC and Gateway appliances for signs of compromise (source)
- CISA Adds Citrix ShareFile Flaw to KEV Catalog Due to In-the-Wild Attacks (source)
- About 2000 Citrix NetScalers Were Compromised in Massive Attack Campaigns (source)
- Attacks on Citrix NetScaler systems linked to ransomware actor (source)
- Citrix NetScaler Alert: Ransomware Hackers Exploiting Critical Vulnerability (source)
- Ransomware group exploits Citrix NetScaler systems for initial access (source)
- Hackers hijack Citrix NetScaler login pages to steal credentials (source)
- Citrix Devices Under Attack: NetScaler Flaw Exploited to Capture User Credentials (source)
- New critical Citrix NetScaler flaw exposes 'sensitive' data (source)
- Citrix NetScaler bug exploited in the wild since August (CVE-2023-4966) (source)