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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.0366 suricata security update 31 January 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: suricata Publisher: Debian Operating System: Debian GNU/Linux 8 UNIX variants (UNIX, Linux, OSX) Windows Impact/Access: Provide Misleading Information -- Remote/Unauthenticated Reduced Security -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-18792 CVE-2019-18625 Original Bulletin: https://lists.debian.org/debian-lts-announce/2020/01/msg00032.html Comment: This advisory references vulnerabilities in products which run on platforms other than Debian. It is recommended that administrators running suricata check for an updated version of the software for their operating system. - --------------------------BEGIN INCLUDED TEXT-------------------- Package : suricata Version : 2.0.7-2+deb8u5 CVE ID : CVE-2019-18625 CVE-2019-18792 Two vulnerabilities have recently been discovered in the stream-tcp code of the intrusion detection and prevention tool Suricata. CVE-2019-18625 It was possible to bypass/evade any tcp based signature by faking a closed TCP session using an evil server. After the TCP SYN packet, it was possible to inject a RST ACK and a FIN ACK packet with a bad TCP Timestamp option. The client would have ignored the RST ACK and the FIN ACK packets because of the bad TCP Timestamp option. CVE-2019-18792 It was possible to bypass/evade any tcp based signature by overlapping a TCP segment with a fake FIN packet. The fake FIN packet had to be injected just before the PUSH ACK packet we wanted to bypass. The PUSH ACK packet (containing the data) would have been ignored by Suricata because it would have overlapped the FIN packet (the sequence and ack number are identical in the two packets). The client would have ignored the fake FIN packet because the ACK flag would not have been set. For Debian 8 "Jessie", these problems have been fixed in version 2.0.7-2+deb8u5. We recommend that you upgrade your suricata packages. Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXjOKQ2aOgq3Tt24GAQjY8xAAg1Gsa5zNSMh8/qT4GoF6ZsMYMH8Tffb6 zKzLoacfAi5fWZa4+dY/xF1Lw8fZAc7hlWLUKPC13hAjoPYFOMAbQgbqaIDpvqI0 VyvAVGyoyBxxecjvLA8dH4jM4IOdGy8bk3zUyW5V8fvVpwKn0f46P8K4nXvxZ+3j PMsLb9FzgFJjB++XL3aBFxH5ONrCVjk9S/gGRGhb1HnRkVAD9IkbOyGOs+wLQ0dN pwQir/rQmDUo2HpHOoKlpja1qQ0aVBQwkuGJbY9I56gM7CUgV47xZzd2pYduK5wp UNjDHgx1c2XYD7BmOZ83Qt1rghHSA829IFYIfejnYRAxj+pQ1XO97HkKitR8TR6j 6i5EO/mhaZxocmvey630hX7oBk9PAfG0UmPR2NdG2/XGg3ph/lIGM0LRsSkyteho xFbogf2ullOj4kxx+Vc3IMagQHwLr/uDWIs4JJWcG9SDF76gKPQN5Q1oPnIQPcAJ Zy9NdpUNyLBBNhesuXNo25txbFbIENw+6cGTRCejvcCmiAp1b1BlIgnqP7xg84H5 zU9+OvPILdHarzLfjy3WoU+rV0K5uKFSUldsr1syenk8PoNLqLi6k+f9r/a/BAAN zzuur1K698Ts19C9NleIaTOR5bGF9sBa1u6DXSs8JPS8RuhCM1OD9bcPzEX6ZI1q auSJd4EoDR8= =bD2p -----END PGP SIGNATURE-----