An issue was discovered in Suricata 5.0.0. It is possible to bypass/evade any tcp based signature by overlapping a TCP segment with a fake FIN packet. The fake FIN packet is injected just before the PUSH ACK packet we want to bypass. The PUSH ACK packet (containing the data) will be ignored by Suricata because it overlaps the FIN packet (the sequence and ack number are identical in the two packets). The client will ignore the fake FIN packet because the ACK flag is not set. Both linux and windows clients are ignoring the injected packet.
Metrics
Affected Vendors & Products
Advisories
| Source | ID | Title |
|---|---|---|
Debian DLA |
DLA-2087-1 | suricata security update |
EUVD |
EUVD-2019-8497 | An issue was discovered in Suricata 5.0.0. It is possible to bypass/evade any tcp based signature by overlapping a TCP segment with a fake FIN packet. The fake FIN packet is injected just before the PUSH ACK packet we want to bypass. The PUSH ACK packet (containing the data) will be ignored by Suricata because it overlaps the FIN packet (the sequence and ack number are identical in the two packets). The client will ignore the fake FIN packet because the ACK flag is not set. Both linux and windows clients are ignoring the injected packet. |
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Tue, 22 Oct 2024 17:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Oisf
Oisf suricata |
|
| CPEs | cpe:2.3:a:suricata-ids:suricata:5.0.0:*:*:*:*:*:*:* |
cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:* cpe:2.3:a:oisf:suricata:5.0.0:*:*:*:*:*:*:* |
| Vendors & Products |
Suricata-ids
Suricata-ids suricata |
Oisf
Oisf suricata |
Status: PUBLISHED
Assigner: mitre
Published:
Updated: 2024-08-05T02:02:39.647Z
Reserved: 2019-11-06T00:00:00
Link: CVE-2019-18792
No data.
Status : Modified
Published: 2020-01-06T18:15:23.183
Modified: 2024-11-21T04:33:34.450
Link: CVE-2019-18792
No data.
OpenCVE Enrichment
No data.
Debian DLA
EUVD