BusyBox versions prior to 1.20.0 contain a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.
The vulnerability exists because of insufficient sanitization of certain input by the affected software. An unauthenticated, remote attacker could exploit this vulnerability by transmitting malicious DHCP server responses to a targeted system. Successful exploitation could allow the attacker to execute arbitrary code on the system.
BusyBox.net has confirmed this vulnerability and has released updated software.
Indicators of Compromise
BusyBox versions prior to 1.20.0 are vulnerable.
The vulnerability exists because the BusyBox udhcpc client performs insufficient input sanitization while handling DHCP server responses. The affected software improperly passes certain shell metacharacters received via the HOSTNAME DHCP server responses.
An unauthenticated, remote attacker could exploit this vulnerability by transmitting malicious server responses to a targeted BusyBox udhcpc client. Successful exploitation could allow an attacker to execute arbitrary code on the client.
Systems that do not use udhcpc by default are not affected by this vulnerability.
Exploiting this vulnerability is difficult because the attacker would need to access to a network adjacent to an affected system and the capability to return malicious DHCP responses to the DHCP client. These requirements decrease the likelihood of a successful exploit.
This vulnerability was remediated by sanitizing the HOST_NAME, DOMAIN_NAME, NIS_DOMAIN, and TFTP_SERVER_NAME options that contain malicious characters.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected systems.
Busybox.net has released updated software at the following link: BusyBox 1.20.1
CentOS packages can be updated using the up2date or yum command.
Red Hat packages can be updated using the up2date or yum command.
Intellishield has modified updated software to address the BusyBox udhcpc response processing remote code execution vulnerability.
2013-March-01 15:29 GMT
CentOS has released updated packages to address the BusyBox udhcpc response processing remote code execution vulnerability.
2012-July-12 17:00 GMT
BusyBox has released an announcement and updated software to address the BusyBox udhcpc response processing remote code execution vulnerability. Red Hat has released an additional security advisory and updated packages to address the vulnerability.
2012-June-25 20:12 GMT
BusyBox contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system. Third-party updates are available.
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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.