CVE-2017-6657 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...
HighCVSS 7.5
EPSS 1.1%
- Published
- Updated
- Exploit status
- No public exploit known
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.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cisco snort++ | All versions | No fix listed |
References
- blog.snort.org third-party-advisory
- 1038483 vdb-entry
- tools.cisco.com vendor-advisory