CVE-2017-6657

7.5HIGH

Key Information:

Vendor
Cisco
Status
Snort 3.0 All Versions Prior To Build 233.
Vendor
CVE Published:
16 May 2017

Summary

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.

Affected Version(s)

Snort 3.0 All prior to build 233. Snort 3.0 All versions prior to build 233.

References

http://www.securitytracker.com/id/1038483
vdb-entryx_refsource_SECTRACK
http://blog.snort.org/2017/05/snort-vulnerabilities-found...
x_refsource_CONFIRM

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.