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AUSCERT External Security Bulletin Redistribution
ESB-2020.3329.2
iTALC and SSVNC vulnerabilities
6 October 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: iTALC
SSVNC
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-15681 CVE-2018-20750 CVE-2018-20749
CVE-2018-20748 CVE-2018-20024 CVE-2018-20023
CVE-2018-20022 CVE-2018-20021 CVE-2018-20020
CVE-2018-20019 CVE-2018-15127 CVE-2018-7225
CVE-2018-2024
Reference: ESB-2019.4771
ESB-2019.4525
ESB-2019.4032
ESB-2019.0298
ESB-2019.0121
ESB-2019.0114
ESB-2019.0009
Original Bulletin:
https://usn.ubuntu.com/4547-1/
https://usn.ubuntu.com/4547-2/
Comment: This bulletin contains two (2) Ubuntu security advisories.
Revision History: October 6 2020: Updated Products, Product Tag and Title
September 29 2020: Initial Release
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USN-4547-1: iTALC vulnerabilities
28 September 2020
Several security issues were fixed in iTALC.
Releases
o Ubuntu 18.04 LTS
Packages
o italc - didact tool which allows teachers to view and control computer labs
Details
It was discovered that an information disclosure vulnerability existed in the
LibVNCServer vendored in iTALC when sending a ServerCutText message. An
attacker could possibly use this issue to expose sensitive information.
(CVE-2019-15681)
It was discovered that the LibVNCServer and LibVNCClient vendored in iTALC
incorrectly handled certain packet lengths. A remote attacker could possibly
use this issue to obtain sensitive information, cause a denial of service, or
execute arbitrary code.
(CVE-2018-15127 CVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022,
CVE-2018-20023, CVE-2018-20024, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750,
CVE-2018-7225, CVE-2019-15681)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04
o italc-client - 1:3.0.3+dfsg1-3ubuntu0.1
o italc-master - 1:3.0.3+dfsg1-3ubuntu0.1
o libitalccore - 1:3.0.3+dfsg1-3ubuntu0.1
In general, a standard system update will make all the necessary changes.
References
o CVE-2018-15127
o CVE-2018-20019
o CVE-2018-20020
o CVE-2018-20021
o CVE-2018-20022
o CVE-2018-20023
o CVE-2018-20024
o CVE-2018-20748
o CVE-2018-20749
o CVE-2018-20750
o CVE-2018-7225
o CVE-2019-15681
Related notices
o USN-3618-1 : libvncserver, libvncserver1, libvncserver0, libvncclient1
o USN-3877-1 : libvncserver, libvncserver1, libvncserver0, libvncclient1
o USN-4407-1 : libvncserver, libvncserver1, libvncclient1
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USN-4547-2: SSVNC vulnerabilities
28 September 2020
Several security issues were fixed in SSVNC.
Releases
o Ubuntu 16.04 LTS
Packages
o ssvnc - Enhanced TightVNC viewer with SSL/SSH tunnel helper
Details
It was discovered that the LibVNCClient vendored in SSVNC incorrectly handled
certain packet lengths. A remote attacker could possibly use this issue to
obtain sensitive information, cause a denial of service, or execute arbitrary
code. (CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-2024)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 16.04
o ssvnc - 1.0.29-2+deb8u1build0.16.04.1
In general, a standard system update will make all the necessary changes.
References
o CVE-2018-20020
o CVE-2018-20021
o CVE-2018-20022
o CVE-2018-20024
Related notices
o USN-3877-1 : libvncserver, libvncserver1, libvncserver0, libvncclient1
o USN-4547-1 : libitalccore, italc, italc-client, italc-master
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