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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.1886 Moderate: tigervnc and fltk security, bug fix, and enhancement update 2 August 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: tigervnc fltk Publisher: Red Hat Operating System: Red Hat Enterprise Linux Server 7 Red Hat Enterprise Linux WS/Desktop 7 Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-7396 CVE-2017-7395 CVE-2017-7394 CVE-2017-7393 CVE-2017-7392 CVE-2017-5581 CVE-2016-10207 Reference: ESB-2017.0748 Original Bulletin: https://access.redhat.com/errata/RHSA-2017:2000 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Moderate: tigervnc and fltk security, bug fix, and enhancement update Advisory ID: RHSA-2017:2000-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2017:2000 Issue date: 2017-08-01 CVE Names: CVE-2016-10207 CVE-2017-5581 CVE-2017-7392 CVE-2017-7393 CVE-2017-7394 CVE-2017-7395 CVE-2017-7396 ===================================================================== 1. Summary: An update for tigervnc and fltk is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux Client (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Server (v. 7) - aarch64, noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - noarch, x86_64 3. Description: Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients which allows users to connect to other desktops running a VNC server. FLTK (pronounced "fulltick") is a cross-platform C++ GUI toolkit. It provides modern GUI functionality without the bloat, and supports 3D graphics via OpenGL and its built-in GLUT emulation. The following packages have been upgraded to a later upstream version: tigervnc (1.8.0), fltk (1.3.4). (BZ#1388620, BZ#1413598) Security Fix(es): * A denial of service flaw was found in the TigerVNC's Xvnc server. A remote unauthenticated attacker could use this flaw to make Xvnc crash by terminating the TLS handshake process early. (CVE-2016-10207) * A double free flaw was found in the way TigerVNC handled ClientFence messages. A remote, authenticated attacker could use this flaw to make Xvnc crash by sending specially crafted ClientFence messages, resulting in denial of service. (CVE-2017-7393) * A missing input sanitization flaw was found in the way TigerVNC handled credentials. A remote unauthenticated attacker could use this flaw to make Xvnc crash by sending specially crafted usernames, resulting in denial of service. (CVE-2017-7394) * An integer overflow flaw was found in the way TigerVNC handled ClientCutText messages. A remote, authenticated attacker could use this flaw to make Xvnc crash by sending specially crafted ClientCutText messages, resulting in denial of service. (CVE-2017-7395) * A buffer overflow flaw, leading to memory corruption, was found in TigerVNC viewer. A remote malicious VNC server could use this flaw to crash the client vncviewer process resulting in denial of service. (CVE-2017-5581) * A memory leak flaw was found in the way TigerVNC handled termination of VeNCrypt connections. A remote unauthenticated attacker could repeatedly send connection requests to the Xvnc server, causing it to consume large amounts of memory resources over time, and ultimately leading to a denial of service due to memory exhaustion. (CVE-2017-7392) * A memory leak flaw was found in the way TigerVNC handled client connections. A remote unauthenticated attacker could repeatedly send connection requests to the Xvnc server, causing it to consume large amounts of memory resources over time, and ultimately leading to a denial of service due to memory exhaustion. (CVE-2017-7396) Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.4 Release Notes linked from the References section. 4. Solution: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 5. Bugs fixed (https://bugzilla.redhat.com/): 1343899 - Disabling vncconfig window 1358090 - shared memory leakage in vncviewer 1388620 - [REBASE] Tigervnc from 1.3 to 1.8 1393971 - [RFE] systemd unit for Xvnc (not vncserver) 1410164 - tigervnc-server fails to remove /tmp files if not gracefully shut down 1413598 - [REBASE] Update fltk to 1.3.4 for tigervnc 1415547 - Rebuilding tigervnc SRPM stops at applying Patch101 1415712 - CVE-2017-5581 tigervnc: Buffer overflow in ModifiablePixelBuffer::fillRect 1418761 - CVE-2016-10207 tigervnc: VNC server can crash when TLS handshake terminates early 1438694 - CVE-2017-7392 tigervnc: SSecurityVeNCrypt memory leak 1438697 - CVE-2017-7393 tigervnc: Double free via crafted fences 1438700 - CVE-2017-7394 tigervnc: Server crash via long usernames 1438701 - CVE-2017-7395 tigervnc: Integer overflow in SMsgReader::readClientCutText 1438703 - CVE-2017-7396 tigervnc: SecurityServer and ClientServer memory leaks 6. Package List: Red Hat Enterprise Linux Client (v. 7): Source: fltk-1.3.4-1.el7.src.rpm tigervnc-1.8.0-1.el7.src.rpm noarch: tigervnc-icons-1.8.0-1.el7.noarch.rpm tigervnc-license-1.8.0-1.el7.noarch.rpm x86_64: fltk-1.3.4-1.el7.i686.rpm fltk-1.3.4-1.el7.x86_64.rpm fltk-debuginfo-1.3.4-1.el7.i686.rpm fltk-debuginfo-1.3.4-1.el7.x86_64.rpm tigervnc-1.8.0-1.el7.x86_64.rpm tigervnc-debuginfo-1.8.0-1.el7.x86_64.rpm tigervnc-server-1.8.0-1.el7.x86_64.rpm tigervnc-server-minimal-1.8.0-1.el7.x86_64.rpm Red Hat Enterprise Linux Client Optional (v. 7): noarch: tigervnc-server-applet-1.8.0-1.el7.noarch.rpm x86_64: fltk-debuginfo-1.3.4-1.el7.i686.rpm fltk-debuginfo-1.3.4-1.el7.x86_64.rpm fltk-devel-1.3.4-1.el7.i686.rpm fltk-devel-1.3.4-1.el7.x86_64.rpm fltk-fluid-1.3.4-1.el7.x86_64.rpm fltk-static-1.3.4-1.el7.i686.rpm fltk-static-1.3.4-1.el7.x86_64.rpm tigervnc-debuginfo-1.8.0-1.el7.x86_64.rpm tigervnc-server-module-1.8.0-1.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode (v. 7): Source: tigervnc-1.8.0-1.el7.src.rpm noarch: tigervnc-license-1.8.0-1.el7.noarch.rpm x86_64: tigervnc-debuginfo-1.8.0-1.el7.x86_64.rpm tigervnc-server-minimal-1.8.0-1.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional (v. 7): Source: fltk-1.3.4-1.el7.src.rpm noarch: tigervnc-icons-1.8.0-1.el7.noarch.rpm tigervnc-server-applet-1.8.0-1.el7.noarch.rpm x86_64: fltk-1.3.4-1.el7.i686.rpm fltk-1.3.4-1.el7.x86_64.rpm fltk-debuginfo-1.3.4-1.el7.i686.rpm fltk-debuginfo-1.3.4-1.el7.x86_64.rpm fltk-devel-1.3.4-1.el7.i686.rpm fltk-devel-1.3.4-1.el7.x86_64.rpm fltk-fluid-1.3.4-1.el7.x86_64.rpm fltk-static-1.3.4-1.el7.i686.rpm fltk-static-1.3.4-1.el7.x86_64.rpm tigervnc-1.8.0-1.el7.x86_64.rpm tigervnc-debuginfo-1.8.0-1.el7.x86_64.rpm tigervnc-server-1.8.0-1.el7.x86_64.rpm tigervnc-server-module-1.8.0-1.el7.x86_64.rpm Red Hat Enterprise Linux Server (v. 7): Source: fltk-1.3.4-1.el7.src.rpm tigervnc-1.8.0-1.el7.src.rpm aarch64: fltk-1.3.4-1.el7.aarch64.rpm fltk-debuginfo-1.3.4-1.el7.aarch64.rpm tigervnc-1.8.0-1.el7.aarch64.rpm tigervnc-debuginfo-1.8.0-1.el7.aarch64.rpm tigervnc-server-1.8.0-1.el7.aarch64.rpm tigervnc-server-minimal-1.8.0-1.el7.aarch64.rpm noarch: tigervnc-icons-1.8.0-1.el7.noarch.rpm tigervnc-license-1.8.0-1.el7.noarch.rpm ppc64: fltk-1.3.4-1.el7.ppc.rpm fltk-1.3.4-1.el7.ppc64.rpm fltk-debuginfo-1.3.4-1.el7.ppc.rpm fltk-debuginfo-1.3.4-1.el7.ppc64.rpm tigervnc-1.8.0-1.el7.ppc64.rpm tigervnc-debuginfo-1.8.0-1.el7.ppc64.rpm tigervnc-server-1.8.0-1.el7.ppc64.rpm tigervnc-server-minimal-1.8.0-1.el7.ppc64.rpm ppc64le: fltk-1.3.4-1.el7.ppc64le.rpm fltk-debuginfo-1.3.4-1.el7.ppc64le.rpm tigervnc-1.8.0-1.el7.ppc64le.rpm tigervnc-debuginfo-1.8.0-1.el7.ppc64le.rpm tigervnc-server-1.8.0-1.el7.ppc64le.rpm tigervnc-server-minimal-1.8.0-1.el7.ppc64le.rpm s390x: fltk-1.3.4-1.el7.s390.rpm fltk-1.3.4-1.el7.s390x.rpm fltk-debuginfo-1.3.4-1.el7.s390.rpm fltk-debuginfo-1.3.4-1.el7.s390x.rpm tigervnc-1.8.0-1.el7.s390x.rpm tigervnc-debuginfo-1.8.0-1.el7.s390x.rpm tigervnc-server-1.8.0-1.el7.s390x.rpm tigervnc-server-minimal-1.8.0-1.el7.s390x.rpm x86_64: fltk-1.3.4-1.el7.i686.rpm fltk-1.3.4-1.el7.x86_64.rpm fltk-debuginfo-1.3.4-1.el7.i686.rpm fltk-debuginfo-1.3.4-1.el7.x86_64.rpm tigervnc-1.8.0-1.el7.x86_64.rpm tigervnc-debuginfo-1.8.0-1.el7.x86_64.rpm tigervnc-server-1.8.0-1.el7.x86_64.rpm tigervnc-server-minimal-1.8.0-1.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional (v. 7): aarch64: fltk-debuginfo-1.3.4-1.el7.aarch64.rpm fltk-devel-1.3.4-1.el7.aarch64.rpm fltk-fluid-1.3.4-1.el7.aarch64.rpm fltk-static-1.3.4-1.el7.aarch64.rpm tigervnc-debuginfo-1.8.0-1.el7.aarch64.rpm tigervnc-server-module-1.8.0-1.el7.aarch64.rpm noarch: tigervnc-server-applet-1.8.0-1.el7.noarch.rpm ppc64: fltk-debuginfo-1.3.4-1.el7.ppc.rpm fltk-debuginfo-1.3.4-1.el7.ppc64.rpm fltk-devel-1.3.4-1.el7.ppc.rpm fltk-devel-1.3.4-1.el7.ppc64.rpm fltk-fluid-1.3.4-1.el7.ppc64.rpm fltk-static-1.3.4-1.el7.ppc.rpm fltk-static-1.3.4-1.el7.ppc64.rpm tigervnc-debuginfo-1.8.0-1.el7.ppc64.rpm tigervnc-server-module-1.8.0-1.el7.ppc64.rpm ppc64le: fltk-debuginfo-1.3.4-1.el7.ppc64le.rpm fltk-devel-1.3.4-1.el7.ppc64le.rpm fltk-fluid-1.3.4-1.el7.ppc64le.rpm fltk-static-1.3.4-1.el7.ppc64le.rpm tigervnc-debuginfo-1.8.0-1.el7.ppc64le.rpm tigervnc-server-module-1.8.0-1.el7.ppc64le.rpm s390x: fltk-debuginfo-1.3.4-1.el7.s390.rpm fltk-debuginfo-1.3.4-1.el7.s390x.rpm fltk-devel-1.3.4-1.el7.s390.rpm fltk-devel-1.3.4-1.el7.s390x.rpm fltk-fluid-1.3.4-1.el7.s390x.rpm fltk-static-1.3.4-1.el7.s390.rpm fltk-static-1.3.4-1.el7.s390x.rpm x86_64: fltk-debuginfo-1.3.4-1.el7.i686.rpm fltk-debuginfo-1.3.4-1.el7.x86_64.rpm fltk-devel-1.3.4-1.el7.i686.rpm fltk-devel-1.3.4-1.el7.x86_64.rpm fltk-fluid-1.3.4-1.el7.x86_64.rpm fltk-static-1.3.4-1.el7.i686.rpm fltk-static-1.3.4-1.el7.x86_64.rpm tigervnc-debuginfo-1.8.0-1.el7.x86_64.rpm tigervnc-server-module-1.8.0-1.el7.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 7): Source: fltk-1.3.4-1.el7.src.rpm tigervnc-1.8.0-1.el7.src.rpm noarch: tigervnc-icons-1.8.0-1.el7.noarch.rpm tigervnc-license-1.8.0-1.el7.noarch.rpm x86_64: fltk-1.3.4-1.el7.i686.rpm fltk-1.3.4-1.el7.x86_64.rpm fltk-debuginfo-1.3.4-1.el7.i686.rpm fltk-debuginfo-1.3.4-1.el7.x86_64.rpm tigervnc-1.8.0-1.el7.x86_64.rpm tigervnc-debuginfo-1.8.0-1.el7.x86_64.rpm tigervnc-server-1.8.0-1.el7.x86_64.rpm tigervnc-server-minimal-1.8.0-1.el7.x86_64.rpm Red Hat Enterprise Linux Workstation Optional (v. 7): noarch: tigervnc-server-applet-1.8.0-1.el7.noarch.rpm x86_64: fltk-debuginfo-1.3.4-1.el7.i686.rpm fltk-debuginfo-1.3.4-1.el7.x86_64.rpm fltk-devel-1.3.4-1.el7.i686.rpm fltk-devel-1.3.4-1.el7.x86_64.rpm fltk-fluid-1.3.4-1.el7.x86_64.rpm fltk-static-1.3.4-1.el7.i686.rpm fltk-static-1.3.4-1.el7.x86_64.rpm tigervnc-debuginfo-1.8.0-1.el7.x86_64.rpm tigervnc-server-module-1.8.0-1.el7.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/ 7. References: https://access.redhat.com/security/cve/CVE-2016-10207 https://access.redhat.com/security/cve/CVE-2017-5581 https://access.redhat.com/security/cve/CVE-2017-7392 https://access.redhat.com/security/cve/CVE-2017-7393 https://access.redhat.com/security/cve/CVE-2017-7394 https://access.redhat.com/security/cve/CVE-2017-7395 https://access.redhat.com/security/cve/CVE-2017-7396 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.4_Release_Notes/index.html 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2017 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFZgOqaXlSAg2UNWIIRAp/cAJ9F1dYdqxlJTpzsV9KUEKK67xq6LwCfUVqb gW2q/s8OKDowmUL3FPH2fKo= =0uca - -----END PGP SIGNATURE----- - --------------------------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. 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