CVE-2018-0239: Input Validation
First published: Thu Apr 19 2018(Updated: )
A vulnerability in the egress packet processing functionality of the Cisco StarOS operating system for Cisco Aggregation Services Router (ASR) 5700 Series devices and Virtualized Packet Core (VPC) System Software could allow an unauthenticated, remote attacker to cause an interface on the device to cease forwarding packets. The device may need to be manually reloaded to clear this Interface Forwarding Denial of Service condition. The vulnerability is due to the failure to properly check that the length of a packet to transmit does not exceed the maximum supported length of the network interface card (NIC). An attacker could exploit this vulnerability by sending a crafted IP packet or a series of crafted IP fragments through an interface on the targeted device. A successful exploit could allow the attacker to cause the network interface to cease forwarding packets. This vulnerability could be triggered by either IPv4 or IPv6 network traffic. This vulnerability affects the following Cisco products when they are running the StarOS operating system and a virtual interface card is installed on the device: Aggregation Services Router (ASR) 5700 Series, Virtualized Packet Core-Distributed Instance (VPC-DI) System Software, Virtualized Packet Core-Single Instance (VPC-SI) System Software. Cisco Bug IDs: CSCvf32385.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco StarOS | =21.0.v0.65819 | |
| Cisco StarOS | =21.0.v4 | |
| Cisco StarOS | =21.1.v6 | |
| Cisco StarOS | =21.3.1 | |
| Cisco StarOS | =21.4.0 | |
| Cisco Asr 5700 |
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Reference Links
Frequently Asked Questions
What is CVE-2018-0239?
CVE-2018-0239 is a vulnerability in the egress packet processing functionality of the Cisco StarOS operating system for Cisco ASR 5700 Series devices and Virtualized Packet Core (VPC) System Software.
What is the severity of CVE-2018-0239?
CVE-2018-0239 has a severity score of 7.5 (high).
Which software versions are affected by CVE-2018-0239?
Versions 21.0.v0.65819, 21.0.v4, 21.1.v6, 21.3.1, and 21.4.0 of the Cisco StarOS operating system are affected.
How does CVE-2018-0239 impact the devices?
CVE-2018-0239 could allow an unauthenticated, remote attacker to cause an interface on the affected devices to become unresponsive.
Where can I find more information about CVE-2018-0239?
You can find more information about CVE-2018-0239 on the following websites: [SecurityFocus](http://www.securityfocus.com/bid/103923), [SecurityTracker](http://www.securitytracker.com/id/1040720), [Cisco Security Advisory](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-staros).
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- agent/weakness
- agent/author
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- agent/tags
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- agent/description
- vendor/cisco
- canonical/cisco staros
- version/cisco staros/21.0.v0.65819
- version/cisco staros/21.0.v4
- version/cisco staros/21.1.v6
- version/cisco staros/21.3.1
- version/cisco staros/21.4.0
- canonical/cisco asr 5700