CVE-2017-6657

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.

7.5

CVSS

Severity: High

CVSS 3.0 •

CVSS 2.0 •

EPSS 0.47%

Vendor Advisory cisco.com

Affected: n/a Snort 3.0 All versions prior to build 233.

References

Link	Tags
http://www.securitytracker.com/id/1038483	vdb entry
http://blog.snort.org/2017/05/snort-vulnerabilities-found.html	third party advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170515-snort	vendor advisory

Frequently Asked Questions

What is the severity of CVE-2017-6657?: CVE-2017-6657 has been scored as a high severity vulnerability.
How to fix CVE-2017-6657?: To fix CVE-2017-6657, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-6657 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2017-6657 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2017-6657?: CVE-2017-6657 affects n/a Snort 3.0 All versions prior to build 233..

This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.