A vulnerability in Quick Emulator (QEMU) configured with network block device (NBD) client support could allow an authenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code on a targeted system.
The vulnerability is due to improper processing of an NBD server's response to an NBD_OPT_LIST request sent from an affected NBD client. An attacker who has access to an NBD server could exploit this vulnerability by persuading a targeted user on an NBD client to send an NBD_OPT_LIST request to the attacker-controlled NBD server. A successful exploit could trigger a stack-based buffer overflow condition that the attacker could use to execute arbitrary code or cause a DoS condition on the targeted NBD client.
QEMU has confirmed the vulnerability and released software updates.
To exploit this vulnerability, an attacker must have access to an NBD server and persuade a targeted user of an NBD client to send an NBD_OPT_LIST request to the server. These requirements may reduce the likelihood of a successful exploit.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to run both firewall and antivirus applications to minimize the potential of inbound and outbound threats.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators can help protect affected systems from external attacks by using a solid firewall strategy.
Administrators are advised to monitor affected systems.
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.