CVE-2017-12194 in spice-gtk
Summary
by MITRE
A flaw was found in the way spice-client processed certain messages sent from the server. An attacker, having control of malicious spice-server, could use this flaw to crash the client or execute arbitrary code with permissions of the user running the client. spice-gtk versions through 0.34 are believed to be vulnerable.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 01/13/2020
The vulnerability identified as CVE-2017-12194 represents a critical security flaw within the spice-client implementation that affects the spice-gtk library versions up to and including 0.34. This issue stems from inadequate input validation and processing mechanisms within the client software responsible for handling communication with spice-servers. The flaw manifests when the client receives specially crafted messages from a malicious server instance, creating a potential attack vector that could be exploited by adversaries who have gained control over a compromised spice-server.
The technical nature of this vulnerability aligns with CWE-125, which describes out-of-bounds read conditions that can occur when a program reads data past the end of a valid buffer. The spice-client's message processing functions fail to properly validate the size and structure of incoming data from the server, allowing attackers to craft malicious payloads that trigger memory corruption. When the client attempts to process these malformed messages, the insufficient bounds checking causes the application to either crash due to segmentation faults or potentially execute arbitrary code through memory corruption techniques. This type of vulnerability falls under the ATT&CK technique T1059.007 for Command and Scripting Interpreter, as the exploitation could enable attackers to execute arbitrary commands with the privileges of the compromised user.
The operational impact of CVE-2017-12194 extends beyond simple denial-of-service conditions, as it creates a persistent security risk for any system utilizing vulnerable spice-client implementations. Organizations relying on virtualization environments that employ spice protocols for remote desktop access face significant exposure, particularly in scenarios where the spice-server might be compromised or where attackers can establish malicious server instances. The vulnerability affects user sessions across various desktop environments and virtualization platforms that depend on the spice-gtk library for remote desktop functionality, making it a widespread concern for enterprise security. Attackers exploiting this flaw could potentially establish persistent access to systems, escalate privileges, or use the compromised client as a pivot point for further attacks within network environments.
Mitigation strategies for CVE-2017-12194 primarily focus on immediate software updates and version management to address the root cause of the vulnerability. System administrators should prioritize upgrading to spice-gtk versions 0.35 and later, which contain the necessary patches to prevent the malformed message processing that leads to memory corruption. Additionally, network segmentation and access controls should be implemented to limit exposure of spice-server instances to trusted networks only, reducing the attack surface for potential exploitation. Security monitoring should include detection of unusual client behavior or connection patterns that might indicate exploitation attempts, while network traffic analysis can help identify malicious server communications. Organizations should also consider implementing additional defensive measures such as privilege separation for spice-client processes and regular security assessments of virtualization environments to ensure comprehensive protection against similar vulnerabilities in the future.