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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.4525 ssvnc security update 2 December 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: ssvnc Publisher: Debian Operating System: Debian GNU/Linux 8 Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-20024 CVE-2018-20022 CVE-2018-20021 CVE-2018-20020 Reference: ESB-2019.4032 ESB-2019.0298 ESB-2019.0114 ESB-2019.0009 Original Bulletin: https://lists.debian.org/debian-lts-announce/2019/11/msg00033.html - --------------------------BEGIN INCLUDED TEXT-------------------- Package : ssvnc Version : 1.0.29-2+deb8u1 CVE ID : CVE-2018-20020 CVE-2018-20021 CVE-2018-20022 CVE-2018-20024 Debian Bug : 945827 Several vulnerabilities have been identified in the VNC code of ssvnc, an encryption-capable VNC client.. The vulnerabilities referenced below are issues that have originally been reported against Debian source package libvncserver (which also ships the libvncclient shared library). The ssvnc source package in Debian ships a custom-patched, stripped down and outdated variant of libvncclient, thus some of libvncclient's security fixes required porting over. CVE-2018-20020 LibVNC contained heap out-of-bound write vulnerability inside structure in VNC client code that can result remote code execution CVE-2018-20021 LibVNC contained a CWE-835: Infinite loop vulnerability in VNC client code. Vulnerability allows attacker to consume excessive amount of resources like CPU and RAM CVE-2018-20022 LibVNC contained multiple weaknesses CWE-665: Improper Initialization vulnerability in VNC client code that allowed attackers to read stack memory and could be abused for information disclosure. Combined with another vulnerability, it could be used to leak stack memory layout and in bypassing ASLR. CVE-2018-20024 LibVNC contained null pointer dereference in VNC client code that could result DoS. For Debian 8 "Jessie", these problems have been fixed in version 1.0.29-2+deb8u1. We recommend that you upgrade your ssvnc 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 iQIVAwUBXeR+SmaOgq3Tt24GAQhnNBAAo4n/7FnpSLA4duxrAYEF5x7u6VzD4LUK X/VfNISoQmDXjMJj6k+17CQDR2Cv2IycvviR04DYDV2e2pF4ekimbOCzIThpC5cS 3X6ra6odxVM6eJIAknO9siI8aYdLdBiAJeFU62B1dpITphFq/GMndpqYZ5a3QjYA Bv38sfpj2C8hadXb05qlXKplGwHY7D2ufkqxjLy8J6Ak2q7WG5Ydh58LKb853YPl 6CevBKi64UV/hOVx4Q4RcQe2j8yi3krLBWzWBJxmQIVIKVU4Xm2XehTHeiROz/fO cG0qZfWxRzw5xZrZpo1cOA4oV4H066A8pEAYmf1GOncLGVm3ZYsz3mE//7TLH0Jv D962kCJ3snUcwFohxYwVIVlW2HBc0y2zgqp1C9ZkLQ+GVBJcBG9WDOKjweoobPEH V8Zmaxer1JOZA9SroGkiB8efriGLrPLQqQmqNKnT2ddZop3JXstGecfU4FgZcQG5 OdHttfJcqZDsKh90Nn9N3ojXLdYisO6aCuou82DpQwtSXbi3rVZbFv4gyjkMwpFJ dqHxvP2pS44y6b3neD+BHkFCAFssiuNgvS5et0KdDk04Wredg5i5QPHfEfpjD/CM 0eIhDjQcXVh1V6GdnRAgr2gDcstrPDCsxZRKet5O1lFTWYnKxl2YBheEjbGZu8a+ 3tOrXGXE0bI= =M2j2 -----END PGP SIGNATURE-----