Vulnerability Description
Cisco Sourcefire Snort 3.0 before build 233 mishandles Ether Type Validation. Since valid ether type and IP protocol numbers do not overlap, Snort++ stores all protocol decoders in a single array. That makes it possible to craft packets that have IP protocol numbers in the ether type field which will confuse the Snort++ decoder. For example, an eth:llc:snap:icmp6 packet will cause a crash because there is no ip6 header with which to calculate the icmp6 checksum. Affected decoders include gre, llc, trans_bridge, ciscometadata, linux_sll, and token_ring. The fix adds a check in the packet manager to validate the ether type before indexing the decoder array. An out of range ether type will raise 116:473.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Snort\+\+ | - |
References
- http://blog.snort.org/2017/05/snort-vulnerabilities-found.htmlThird Party Advisory
- http://www.securitytracker.com/id/1038483
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2Vendor Advisory
- http://blog.snort.org/2017/05/snort-vulnerabilities-found.htmlThird Party Advisory
- http://www.securitytracker.com/id/1038483
FAQ
What is CVE-2017-6657?
CVE-2017-6657 is a vulnerability with a CVSS score of 7.5 (HIGH). Cisco Sourcefire Snort 3.0 before build 233 mishandles Ether Type Validation. Since valid ether type and IP protocol numbers do not overlap, Snort++ stores all protocol decoders in a single array. Tha...
How severe is CVE-2017-6657?
CVE-2017-6657 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2017-6657?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Snort\+\+.