CVE-2021-45098

published 2021-12-16

CVE-2021-45098: An issue was discovered in Suricata before 6.0.4. It is possible to bypass/evade any HTTP-based signature by faking an RST TCP packet with random TCP options…

Priority P3 46 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I H A N

An issue was discovered in Suricata before 6.0.4. It is possible to bypass/evade any HTTP-based signature by faking an RST TCP packet with random TCP options of the md5header from the client side. After the three-way handshake, it's possible to inject an RST ACK with a random TCP md5header option. Then, the client can send an HTTP GET request with a forbidden URL. The server will ignore the RST ACK and send the response HTTP packet for the client's request. These packets will not trigger a Suricata reject action.

Affected

9 ranges

Vendor	Product	Version range	Fixed in
debian	debian_linux	—	—
debian	debian_linux	—	—
debian	debian_linux	—	—
debian	suricata	< suricata 1:6.0.4-1 (bookworm)	suricata 1:6.0.4-1 (bookworm)
oisf	suricata	< 6.0.4	6.0.4
oisf	suricata	>= 0 < 1:6.0.1-3+deb11u1	1:6.0.1-3+deb11u1
oisf	suricata	>= 0 < 1:6.0.4-1	1:6.0.4-1
oisf	suricata	>= 0 < 1:6.0.4-1	1:6.0.4-1
oisf	suricata	>= 0 < 1:6.0.4-1	1:6.0.4-1

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

nvd v2.0 5.0 MEDIUM AV:N/AC:L/Au:N/C:N/I:P/A:N

osv 7.5 HIGH

vendor_debian 7.5 HIGH

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