CVE-2019-18792

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Summary

CVECVE-2019-18792
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-01-06 18:15:00 UTC
Updated2021-07-21 11:39:00 UTC
DescriptionAn 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.

Risk And Classification

Problem Types: CWE-436

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 8.0 All All All
Operating System Debian Debian Linux 8.0 All All All
Application Suricata-ids Suricata All All All All
Application Suricata-ids Suricata 5.0.0 All All All
Application Suricata-ids Suricata All All All All
Application Suricata-ids Suricata 5.0.0 All All All

References

ReferenceSourceLinkTags
stream: reject broken ACK packets · OISF/suricata@1c63d39 · GitHub CONFIRM github.com Patch, Third Party Advisory
Security #3394: TCP evasion technique by overlapping a TCP segment with a fake packet (4.1.x) - Suricata - Open Information Security Foundation MISC redmine.openinfosecfoundation.org Exploit, Third Party Advisory
[SECURITY] [DLA 2087-1] suricata security update MLIST lists.debian.org Third Party Advisory
Security #3324: TCP evasion technique by overlapping a TCP segment with a fake packet - Suricata - Open Information Security Foundation MISC redmine.openinfosecfoundation.org Exploit, Third Party Advisory
stream: reject broken ACK packets · OISF/suricata@fa692df · GitHub CONFIRM github.com Patch, Third Party Advisory
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