CVE-2017-6657
Cisco Sourcefire Snort 3.0 before build 233 mishandles Ether Type Validation.
Published 9 y ago · modified 4 mo ago · JSON
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.
Exploit prediction (EPSS)
1.06% probability of exploitation in the next 30 days, higher than 65% of all scored CVEs.
CVSS scores
| Assigned by | Version | Score | Vector |
|---|---|---|---|
| NVD | 3.0 | 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Affected products
- n/a Snort 3.0 All versions prior to build 233.
References
- securitytracker.com /id/1038483 · vdb-entry, x_refsource_SECTRACK, x_transferred
- blog.snort.org /2017/05/snort-vulnerabilities-found.html · x_refsource_CONFIRM, x_transferred
- tools.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-20170515-snort · Vendor Advisory
Sources
- CVE List: CVE-2017-6657
- NVD: CVE-2017-6657
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