CVE-2017-6657 Cisco Sourcefire Snort 3.0 before build 233 mishandles Ether Type Validation.
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2017-6657?
CVE-2017-6657 is a high-severity vulnerability in Snort 3.0 All versions prior to build 233., published on 16 May 2017.
Official 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.
Which versions are affected by CVE-2017-6657?
It affects 1 product.
Products include Cisco Snort\+\+.
How do I fix CVE-2017-6657?
No fix has been published for CVE-2017-6657 yet. Limit exposure of the affected software until one is available.
Is CVE-2017-6657 being exploited?
There is no known exploitation of CVE-2017-6657 in the wild and no public exploit code.
Sources
Also known as GHSA-h9jm-vc47-2v23.