CVE-2018-20023
published 2018-12-19CVE-2018-20023: LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker…
PriorityP340high7.5CVSS 3.0
AVNACLPRNUINSUCHINAN
EPSS
2.50%
82.7th percentile
LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR
Affected
13 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| debian | debian_linux | — | — |
| debian | debian_linux | — | — |
| debian | libvncserver | < libvncserver 0.9.11+dfsg-1.2 (bookworm) | libvncserver 0.9.11+dfsg-1.2 (bookworm) |
| debian | veyon | < libvncserver 0.9.11+dfsg-1.2 (bookworm) | libvncserver 0.9.11+dfsg-1.2 (bookworm) |
| libvnc_project | libvncserver | < 0.9.12 | 0.9.12 |
| libvncserver_project | libvncserver | >= 0 < 0.9.11+dfsg-1.2 | 0.9.11+dfsg-1.2 |
| libvncserver_project | libvncserver | >= 0 < 0.9.11+dfsg-1.2 | 0.9.11+dfsg-1.2 |
| libvncserver_project | libvncserver | >= 0 < 0.9.11+dfsg-1.2 | 0.9.11+dfsg-1.2 |
| libvncserver_project | libvncserver | >= 0 < 0.9.11+dfsg-1.2 | 0.9.11+dfsg-1.2 |
CVSS provenance
nvdv3.07.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:P/I:N/A:N
osv9.8CRITICAL
vendor_ubuntu9.8CRITICAL
vendor_debian7.5HIGH
vendor_redhat7.5HIGH
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GHSA
GHSA-h752-h62f-w8j9: LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows
ghsa_unreviewed·2022-05-13
CVE-2018-20023 [HIGH] CWE-665 GHSA-h752-h62f-w8j9: LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows
LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR
OSV
italc vulnerabilities
osv·2020-10-20·CVSS 7.5
CVE-2014-6051 [HIGH] italc vulnerabilities
italc vulnerabilities
Nicolas Ruff discovered that iTALC had buffer overflows, divide-by-zero errors
and didn't check malloc return values. A remote attacker could use these issues
to cause a denial of service or possibly execute arbitrary code.
(CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054, CVE-2014-6055)
Josef Gajdusek discovered that iTALC had heap-based buffer overflow
vulnerabilities. A remote attacker could used these issues to cause a denial of
service or possibly execute arbitrary code. (CVE-2016-9941, CVE-2016-9942)
It was discovered that iTALC had an out-of-bounds write, multiple heap
out-of-bounds writes, an infinite loop, improper initializations, and null
pointer vulnerabilities. A remote attacker could used these issues to cause a
denial of service or possibl
OSV
italc vulnerabilities
osv·2020-09-28·CVSS 9.8
CVE-2019-15681 [CRITICAL] italc vulnerabilities
italc vulnerabilities
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)
OSV
CVE-2018-20023: LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows
osv·2018-12-19·CVSS 7.5
CVE-2018-20023 [HIGH] CVE-2018-20023: LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows
LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR
Ubuntu
iTALC vulnerabilities
vendor_ubuntu·2020-10-20·CVSS 7.5
CVE-2018-20749 [HIGH] iTALC vulnerabilities
Title: iTALC vulnerabilities
Summary: Several security issues were fixed in iTALC.
Nicolas Ruff discovered that iTALC had buffer overflows, divide-by-zero errors
and didn't check malloc return values. A remote attacker could use these issues
to cause a denial of service or possibly execute arbitrary code.
(CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054, CVE-2014-6055)
Josef Gajdusek discovered that iTALC had heap-based buffer overflow
vulnerabilities. A remote attacker could used these issues to cause a denial of
service or possibly execute arbitrary code. (CVE-2016-9941, CVE-2016-9942)
It was discovered that iTALC had an out-of-bounds write, multiple heap
out-of-bounds writes, an infinite loop, improper initializations, and null
pointer vulnerabilities. A remote attacker c
Ubuntu
iTALC vulnerabilities
vendor_ubuntu·2020-09-28·CVSS 9.8
CVE-2018-15127 [CRITICAL] iTALC vulnerabilities
Title: iTALC vulnerabilities
Summary: Several security issues were fixed in iTALC.
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)
Instructions: In general, a s
Ubuntu
LibVNCServer vulnerabilities
vendor_ubuntu·2019-01-31
CVE-2018-15126 LibVNCServer vulnerabilities
Title: LibVNCServer vulnerabilities
Summary: Several security issues were fixed in LibVNCServer.
It was discovered that LibVNCServer incorrectly handled certain operations.
A remote attacker able to connect to applications using LibVNCServer could
possibly use this issue to obtain sensitive information, cause a denial of
service, or execute arbitrary code.
Instructions: After a standard system update you need to restart LibVNCServer
applications to make all the necessary changes.
Red Hat
libvncserver: Improper initialization in VNC Repeater client code allows for information disclosure
vendor_redhat·2018-12-19·CVSS 7.5
CVE-2018-20023 [HIGH] CWE-665 libvncserver: Improper initialization in VNC Repeater client code allows for information disclosure
libvncserver: Improper initialization in VNC Repeater client code allows for information disclosure
LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR
Package: libvncserver (Red Hat Enterprise Linux 6) - Not affected
Package: libvncserver (Red Hat Enterprise Linux 7) - Not affected
Package: libvncserver (Red Hat Enterprise Linux 8) - Will not fix
Debian
CVE-2018-20023: libvncserver - LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Imprope...
vendor_debian·2018·CVSS 7.5
CVE-2018-20023 [HIGH] CVE-2018-20023: libvncserver - LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Imprope...
LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR
Scope: local
bookworm: resolved (fixed in 0.9.11+dfsg-1.2)
bullseye: resolved (fixed in 0.9.11+dfsg-1.2)
forky: resolved (fixed in 0.9.11+dfsg-1.2)
sid: resolved (fixed in 0.9.11+dfsg-1.2)
trixie: resolved (fixed in 0.9.11+dfsg-1.2)
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2018-20023 libvncserver: Improper initialization in VNC Repeater client code allows for information disclosure [epel-7]
bugzilla·2018-12-20·CVSS 7.5
CVE-2018-20023 [HIGH] CVE-2018-20023 libvncserver: Improper initialization in VNC Repeater client code allows for information disclosure [epel-7]
CVE-2018-20023 libvncserver: Improper initialization in VNC Repeater client code allows for information disclosure [epel-7]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of epel-7.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
Discussio
Bugzilla
CVE-2018-20023 libvncserver: Improper initialization in VNC Repeater client code allows for information disclosure [fedora-all]
bugzilla·2018-12-20·CVSS 7.5
CVE-2018-20023 [HIGH] CVE-2018-20023 libvncserver: Improper initialization in VNC Repeater client code allows for information disclosure [fedora-all]
CVE-2018-20023 libvncserver: Improper initialization in VNC Repeater client code allows for information disclosure [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NO
Bugzilla
CVE-2018-20023 libvncserver: Improper initialization in VNC Repeater client code allows for information disclosure
bugzilla·2018-12-20·CVSS 7.5
CVE-2018-20023 [HIGH] CVE-2018-20023 libvncserver: Improper initialization in VNC Repeater client code allows for information disclosure
CVE-2018-20023 libvncserver: Improper initialization in VNC Repeater client code allows for information disclosure
LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR
External Reference:
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-033-libvnc-memory-leak/
Upstream Patch:
https://github.com/LibVNC/libvncserver/commit/8b06f835e259652b0ff026898014fc7297ade858
Discussion:
Created libvncserver tracking bugs for this issue:
Affects: epel-7 [bug 1661130]
Affects: fedora-all [bug 1
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-033-libvnc-memory-leak/https://lists.debian.org/debian-lts-announce/2018/12/msg00017.htmlhttps://lists.debian.org/debian-lts-announce/2019/10/msg00042.htmlhttps://security.gentoo.org/glsa/201908-05https://usn.ubuntu.com/3877-1/https://usn.ubuntu.com/4547-1/https://usn.ubuntu.com/4587-1/https://www.debian.org/security/2019/dsa-4383https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-033-libvnc-memory-leak/https://lists.debian.org/debian-lts-announce/2018/12/msg00017.htmlhttps://lists.debian.org/debian-lts-announce/2019/10/msg00042.htmlhttps://security.gentoo.org/glsa/201908-05https://usn.ubuntu.com/3877-1/https://usn.ubuntu.com/4547-1/https://usn.ubuntu.com/4587-1/https://www.debian.org/security/2019/dsa-4383
2018-12-19
Published