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AUSCERT External Security Bulletin Redistribution
ESB-2020.2972
libvncserver security update
31 August 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: libvncserver
Publisher: Debian
Operating System: Debian GNU/Linux 9
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-14405 CVE-2020-14404 CVE-2020-14403
CVE-2020-14402 CVE-2020-14401 CVE-2020-14400
CVE-2020-14399 CVE-2020-14397 CVE-2019-20839
Reference: ESB-2020.2727
ESB-2020.2535
ESB-2020.2469
ESB-2020.2248
Original Bulletin:
https://www.debian.org/lts/security/2020/dla-2347
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Debian LTS Advisory DLA-2347-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Mike Gabriel
August 28, 2020 https://wiki.debian.org/LTS
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Package : libvncserver
Version : 0.9.11+dfsg-1.3~deb9u5
CVE ID : CVE-2019-20839 CVE-2020-14397 CVE-2020-14399 CVE-2020-14400
CVE-2020-14401 CVE-2020-14402 CVE-2020-14403 CVE-2020-14404
CVE-2020-14405
Several minor vulnerabilities have been discovered in libvncserver, a
server and client implementation of the VNC protocol.
CVE-2019-20839
libvncclient/sockets.c in LibVNCServer had a buffer overflow via a
long socket filename.
CVE-2020-14397
libvncserver/rfbregion.c has a NULL pointer dereference.
CVE-2020-14399
Byte-aligned data was accessed through uint32_t pointers in
libvncclient/rfbproto.c.
NOTE: This issue has been disputed by third parties; there is
reportedly "no trust boundary crossed".
CVE-2020-14400
Byte-aligned data was accessed through uint16_t pointers in
libvncserver/translate.c.
NOTE: This issue has been disputed by third parties. There is no
known path of exploitation or cross of a trust boundary.
CVE-2020-14401
libvncserver/scale.c had a pixel_value integer overflow.
CVE-2020-14402
libvncserver/corre.c allowed out-of-bounds access via encodings.
CVE-2020-14403
libvncserver/hextile.c allowed out-of-bounds access via encodings.
CVE-2020-14404
libvncserver/rre.c allowed out-of-bounds access via encodings.
CVE-2020-14405
libvncclient/rfbproto.c did not limit TextChat size.
For Debian 9 stretch, these problems have been fixed in version
0.9.11+dfsg-1.3~deb9u5.
We recommend that you upgrade your libvncserver packages.
For the detailed security status of libvncserver please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/libvncserver
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
- --
mike gabriel aka sunweaver (Debian Developer)
fon: +49 (1520) 1976 148
GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22 0782 9AF4 6B30 2577 1B31
mail: sunweaver@debian.org, http://sunweavers.net
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