var-202006-1850
Vulnerability from variot

libvncclient/sockets.c in LibVNCServer before 0.9.13 has a buffer overflow via a long socket filename. LibVNCServer Exists in a classic buffer overflow vulnerability.Service operation interruption (DoS) It may be put into a state. Pillow is a Python-based image processing library. There is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256

====================================================================
Red Hat Security Advisory

Synopsis: Moderate: libvncserver security update Advisory ID: RHSA-2021:1811-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:1811 Issue date: 2021-05-18 CVE Names: CVE-2018-21247 CVE-2019-20839 CVE-2020-14397 CVE-2020-14405 CVE-2020-25708 ==================================================================== 1. Summary:

An update for libvncserver is now available for Red Hat Enterprise Linux 8.

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.

  1. Relevant releases/architectures:

Red Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64

  1. Description:

LibVNCServer is a C library that enables you to implement VNC server functionality into own programs.

Security Fix(es):

  • libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)

  • libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)

  • libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)

  • libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)

  • libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes linked from the References section.

  1. 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

  1. Bugs fixed (https://bugzilla.redhat.com/):

1849877 - CVE-2019-20839 libvncserver: buffer overflow in ConnectClientToUnixSock() 1849886 - CVE-2018-21247 libvncserver: uninitialized memory contents are vulnerable to Information Leak 1860325 - CVE-2020-14405 libvncserver: libvncclient/rfbproto.c does not limit TextChat size 1860344 - CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference 1896739 - CVE-2020-25708 libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS

  1. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source: libvncserver-0.9.11-17.el8.src.rpm

aarch64: libvncserver-0.9.11-17.el8.aarch64.rpm libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm

ppc64le: libvncserver-0.9.11-17.el8.ppc64le.rpm libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm

s390x: libvncserver-0.9.11-17.el8.s390x.rpm libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm libvncserver-debugsource-0.9.11-17.el8.s390x.rpm

x86_64: libvncserver-0.9.11-17.el8.i686.rpm libvncserver-0.9.11-17.el8.x86_64.rpm libvncserver-debuginfo-0.9.11-17.el8.i686.rpm libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm libvncserver-debugsource-0.9.11-17.el8.i686.rpm libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm

Red Hat CodeReady Linux Builder (v. 8):

aarch64: libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm libvncserver-devel-0.9.11-17.el8.aarch64.rpm

ppc64le: libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm libvncserver-devel-0.9.11-17.el8.ppc64le.rpm

s390x: libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm libvncserver-debugsource-0.9.11-17.el8.s390x.rpm libvncserver-devel-0.9.11-17.el8.s390x.rpm

x86_64: libvncserver-debuginfo-0.9.11-17.el8.i686.rpm libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm libvncserver-debugsource-0.9.11-17.el8.i686.rpm libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm libvncserver-devel-0.9.11-17.el8.i686.rpm libvncserver-devel-0.9.11-17.el8.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/

  1. Contact:

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1

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-- RHSA-announce mailing list RHSA-announce@redhat.com https://listman.redhat.com/mailman/listinfo/rhsa-announce . ========================================================================== Ubuntu Security Notice USN-4434-1 July 23, 2020

libvncserver vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in LibVNCServer.

Software Description: - libvncserver: vnc server library

Details:

Ramin Farajpour Cami discovered that LibVNCServer incorrectly handled certain malformed unix socket names. A remote attacker could exploit this with a crafted socket name, leading to a denial of service, or possibly execute arbitrary code. (CVE-2019-20839)

It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)

Christian Beier discovered that LibVNCServer incorrectly handled anonymous TLS connections. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-14396)

It was discovered that LibVNCServer incorrectly handled region clipping. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14397)

It was discovered that LibVNCServer did not properly reset incorrectly terminated TCP connections. A remote attacker could possibly use this issue to cause an infinite loop, resulting in a denial of service. (CVE-2020-14398)

It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399, CVE-2020-14400)

It was discovered that LibVNCServer incorrectly handled screen scaling on the server side. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14401)

It was discovered that LibVNCServer incorrectly handled encodings. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)

It was discovered that LibVNCServer incorrectly handled TextChat messages. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14405)

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04 LTS: libvncclient1 0.9.12+dfsg-9ubuntu0.2 libvncserver1 0.9.12+dfsg-9ubuntu0.2

Ubuntu 18.04 LTS: libvncclient1 0.9.11+dfsg-1ubuntu1.3 libvncserver1 0.9.11+dfsg-1ubuntu1.3

Ubuntu 16.04 LTS: libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.5 libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.5

After a standard system update you need to restart LibVNCServer applications to make all the necessary changes.

References: https://usn.ubuntu.com/4434-1 CVE-2019-20839, CVE-2019-20840, CVE-2020-14396, CVE-2020-14397, CVE-2020-14398, CVE-2020-14399, CVE-2020-14400, CVE-2020-14401, CVE-2020-14402, CVE-2020-14403, CVE-2020-14404, CVE-2020-14405

Package Information: https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.3 https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.5

Show details on source website

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    "data": "libvncclient/sockets.c in LibVNCServer before 0.9.13 has a buffer overflow via a long socket filename. LibVNCServer Exists in a classic buffer overflow vulnerability.Service operation interruption (DoS) It may be put into a state. Pillow is a Python-based image processing library. \nThere is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n====================================================================                   \nRed Hat Security Advisory\n\nSynopsis:          Moderate: libvncserver security update\nAdvisory ID:       RHSA-2021:1811-01\nProduct:           Red Hat Enterprise Linux\nAdvisory URL:      https://access.redhat.com/errata/RHSA-2021:1811\nIssue date:        2021-05-18\nCVE Names:         CVE-2018-21247 CVE-2019-20839 CVE-2020-14397\n                   CVE-2020-14405 CVE-2020-25708\n====================================================================\n1. Summary:\n\nAn update for libvncserver is now available for Red Hat Enterprise Linux 8. \n\nRed Hat Product Security has rated this update as having a security impact\nof Moderate. A Common Vulnerability Scoring System (CVSS) base score, which\ngives a detailed severity rating, is available for each vulnerability from\nthe CVE link(s) in the References section. \n\n2. Relevant releases/architectures:\n\nRed Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64\nRed Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64\n\n3. Description:\n\nLibVNCServer is a C library that enables you to implement VNC server\nfunctionality into own programs. \n\nSecurity Fix(es):\n\n* libvncserver: uninitialized memory contents are vulnerable to Information\nLeak (CVE-2018-21247)\n\n* libvncserver: buffer overflow in ConnectClientToUnixSock()\n(CVE-2019-20839)\n\n* libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference\n(CVE-2020-14397)\n\n* libvncserver: libvncclient/rfbproto.c does not limit TextChat size\n(CVE-2020-14405)\n\n* libvncserver: libvncserver/rfbserver.c has a divide by zero which could\nresult in DoS (CVE-2020-25708)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE\npage(s) listed in the References section. \n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat\nEnterprise Linux 8.4 Release Notes linked from the References section. \n\n4. Solution:\n\nFor details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n1849877 - CVE-2019-20839 libvncserver: buffer overflow in ConnectClientToUnixSock()\n1849886 - CVE-2018-21247 libvncserver: uninitialized memory contents are vulnerable to Information Leak\n1860325 - CVE-2020-14405 libvncserver: libvncclient/rfbproto.c does not limit TextChat size\n1860344 - CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference\n1896739 - CVE-2020-25708 libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS\n\n6. Package List:\n\nRed Hat Enterprise Linux AppStream (v. 8):\n\nSource:\nlibvncserver-0.9.11-17.el8.src.rpm\n\naarch64:\nlibvncserver-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.aarch64.rpm\n\nppc64le:\nlibvncserver-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm\n\ns390x:\nlibvncserver-0.9.11-17.el8.s390x.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.s390x.rpm\nlibvncserver-debugsource-0.9.11-17.el8.s390x.rpm\n\nx86_64:\nlibvncserver-0.9.11-17.el8.i686.rpm\nlibvncserver-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.i686.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.i686.rpm\nlibvncserver-debugsource-0.9.11-17.el8.x86_64.rpm\n\nRed Hat CodeReady Linux Builder (v. 8):\n\naarch64:\nlibvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.aarch64.rpm\nlibvncserver-devel-0.9.11-17.el8.aarch64.rpm\n\nppc64le:\nlibvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-devel-0.9.11-17.el8.ppc64le.rpm\n\ns390x:\nlibvncserver-debuginfo-0.9.11-17.el8.s390x.rpm\nlibvncserver-debugsource-0.9.11-17.el8.s390x.rpm\nlibvncserver-devel-0.9.11-17.el8.s390x.rpm\n\nx86_64:\nlibvncserver-debuginfo-0.9.11-17.el8.i686.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.i686.rpm\nlibvncserver-debugsource-0.9.11-17.el8.x86_64.rpm\nlibvncserver-devel-0.9.11-17.el8.i686.rpm\nlibvncserver-devel-0.9.11-17.el8.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security.  Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. More contact\ndetails at https://access.redhat.com/security/team/contact/\n\nCopyright 2021 Red Hat, Inc. \n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1\n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\n8A9MNz92TFY=uZts\n-----END PGP SIGNATURE-----\n\n--\nRHSA-announce mailing list\nRHSA-announce@redhat.com\nhttps://listman.redhat.com/mailman/listinfo/rhsa-announce\n. ==========================================================================\nUbuntu Security Notice USN-4434-1\nJuly 23, 2020\n\nlibvncserver vulnerabilities\n==========================================================================\n\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 20.04 LTS\n- Ubuntu 18.04 LTS\n- Ubuntu 16.04 LTS\n\nSummary:\n\nSeveral security issues were fixed in LibVNCServer. \n\nSoftware Description:\n- libvncserver: vnc server library\n\nDetails:\n\nRamin Farajpour Cami discovered that LibVNCServer incorrectly handled\ncertain malformed unix socket names. A remote attacker could exploit this\nwith a crafted socket name, leading to a denial of service, or possibly\nexecute arbitrary code. (CVE-2019-20839)\n\nIt was discovered that LibVNCServer did not properly access byte-aligned\ndata. A remote attacker could possibly use this issue to cause\nLibVNCServer to crash, resulting in a denial of service. This issue only\naffected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)\n\nChristian Beier discovered that LibVNCServer incorrectly handled anonymous\nTLS connections. A remote attacker could possibly use this issue to cause\nLibVNCServer to crash, resulting in a denial of service. This issue only\naffected Ubuntu 20.04 LTS. (CVE-2020-14396)\n\nIt was discovered that LibVNCServer incorrectly handled region clipping. A\nremote attacker could possibly use this issue to cause LibVNCServer to\ncrash, resulting in a denial of service. (CVE-2020-14397)\n\nIt was discovered that LibVNCServer did not properly reset incorrectly\nterminated TCP connections. A remote attacker could possibly use this\nissue to cause an infinite loop, resulting in a denial of service. \n(CVE-2020-14398)\n\nIt was discovered that LibVNCServer did not properly access byte-aligned\ndata. A remote attacker could possibly use this issue to cause\nLibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399,\nCVE-2020-14400)\n\nIt was discovered that LibVNCServer incorrectly handled screen scaling on\nthe server side. A remote attacker could use this issue to cause\nLibVNCServer to crash, resulting in a denial of service, or possibly\nexecute arbitrary code. (CVE-2020-14401)\n\nIt was discovered that LibVNCServer incorrectly handled encodings. A\nremote attacker could use this issue to cause LibVNCServer to crash,\nresulting in a denial of service, or possibly execute arbitrary code. \n(CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)\n\nIt was discovered that LibVNCServer incorrectly handled TextChat messages. \nA remote attacker could possibly use this issue to cause LibVNCServer to\ncrash, resulting in a denial of service. (CVE-2020-14405)\n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 20.04 LTS:\n  libvncclient1                   0.9.12+dfsg-9ubuntu0.2\n  libvncserver1                   0.9.12+dfsg-9ubuntu0.2\n\nUbuntu 18.04 LTS:\n  libvncclient1                   0.9.11+dfsg-1ubuntu1.3\n  libvncserver1                   0.9.11+dfsg-1ubuntu1.3\n\nUbuntu 16.04 LTS:\n  libvncclient1                   0.9.10+dfsg-3ubuntu0.16.04.5\n  libvncserver1                   0.9.10+dfsg-3ubuntu0.16.04.5\n\nAfter a standard system update you need to restart LibVNCServer\napplications to make all the necessary changes. \n\nReferences:\n  https://usn.ubuntu.com/4434-1\n  CVE-2019-20839, CVE-2019-20840, CVE-2020-14396, CVE-2020-14397,\n  CVE-2020-14398, CVE-2020-14399, CVE-2020-14400, CVE-2020-14401,\n  CVE-2020-14402, CVE-2020-14403, CVE-2020-14404, CVE-2020-14405\n\nPackage Information:\n  https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.2\n  https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.3\n  https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.5\n",
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