Vulnerability in Cisco Snort\+\+
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. 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.011 (64.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Cisco Snort\+\+
- Snort 3.0 All Versions Prior To Build 233. — versions Snort 3.0 All versions prior to build 233.
References
- www.securitytracker.com/id/1038483 (vdb-entry)
- blog.snort.org/2017/05/snort-vulnerabilities-found.html (Third Party Advisory)
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170515… (Vendor Advisory)
Frequently asked questions
- What is CVE-2017-6657?
- CVE-2017-6657 is a high-severity vulnerability in Cisco Snort\+\+. CVSS score: 7.5/10. Published 2017-05-16.
- How severe is CVE-2017-6657?
- High severity. CVSS v3 base score is 7.5 out of 10.