CVE-2018-20019
published 2018-12-19CVE-2018-20019: LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can result…
PriorityP261critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
9.47%
94.9th percentile
LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can result remote code execution
Affected
24 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 | libvncserver | < libvncserver 0.9.11+dfsg-1.3 (bookworm) | libvncserver 0.9.11+dfsg-1.3 (bookworm) |
| debian | veyon | < libvncserver 0.9.11+dfsg-1.3 (bookworm) | libvncserver 0.9.11+dfsg-1.3 (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-1.3 | 0.9.11+dfsg-1.3 |
| libvncserver_project | libvncserver | >= 0 < 0.9.11+dfsg-1.2 | 0.9.11+dfsg-1.2 |
| libvncserver_project | libvncserver | >= 0 < 0.9.11+dfsg-1.3 | 0.9.11+dfsg-1.3 |
| libvncserver_project | libvncserver | >= 0 < 0.9.11+dfsg-1.2 | 0.9.11+dfsg-1.2 |
| libvncserver_project | libvncserver | >= 0 < 0.9.11+dfsg-1.3 | 0.9.11+dfsg-1.3 |
| libvncserver_project | libvncserver | >= 0 < 0.9.11+dfsg-1.2 | 0.9.11+dfsg-1.2 |
| libvncserver_project | libvncserver | >= 0 < 0.9.11+dfsg-1.3 | 0.9.11+dfsg-1.3 |
| siemens | simatic_itc1500_firmware | >= 3.0.0.0 < 3.2.1.0 | 3.2.1.0 |
| siemens | simatic_itc1500_pro_firmware | >= 3.0.0.0 < 3.2.1.0 | 3.2.1.0 |
| siemens | simatic_itc1900_firmware | >= 3.0.0.0 < 3.2.1.0 | 3.2.1.0 |
| siemens | simatic_itc1900_pro_firmware | >= 3.0.0.0 < 3.2.1.0 | 3.2.1.0 |
| siemens | simatic_itc2200_firmware | >= 3.0.0.0 < 3.2.1.0 | 3.2.1.0 |
| siemens | simatic_itc2200_pro_firmware | >= 3.0.0.0 < 3.2.1.0 | 3.2.1.0 |
Detection & IOCsextracted from sources · hover to see the quote
- →The initial upstream patch (commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f) was incomplete; systems patched only to that commit remain vulnerable. Verify fix version is 0.9.12+ or Debian package 0.9.11+dfsg-1.3 or later. ↗
- →Heap out-of-bounds writes occur in libvncclient/rfbproto.c; focus code review and memory-safety tooling (e.g., AddressSanitizer) on that translation unit when analysing suspicious libvncserver builds. ↗
- ·Red Hat Enterprise Linux 6 is marked 'Will not fix' for CVE-2018-20019; deployments on RHEL 6 running libvncserver will remain permanently unpatched by the vendor. ↗
- ·The fix for CVE-2018-20019 was incomplete; CVE-2018-20748 tracks the residual heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c that remained after the initial patch. ↗
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv2.07.5HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P
osv9.8CRITICAL
vendor_debian9.8CRITICAL
vendor_redhat9.8CRITICAL
vendor_ubuntu9.8CRITICAL
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CISA ICS
Siemens SIMATIC ITC
cisa_ics·2021-12-16·CVSS 9.8
[CRITICAL] Siemens SIMATIC ITC
## Archived Content In an effort to keep CISA.gov current, the archive contains outdated information that may not reflect current policy or programs.
ICS Advisory
##
Siemens SIMATIC ITC
Last RevisedDecember 16, 2021
Alert CodeICSA-21-350-12
## 1. EXECUTIVE SUMMARY
- CVSS v3 9.8
- ATTENTION: Exploitable remotely/low attack complexity
- Vendor: Siemens
- Equipment: SIMATIC ITC Products
- Vulnerabilities: Using Components with Known Vulnerabilities
## 2. RISK EVALUATION
Successful exploitation of these LibVNC vulnerabilities could allow remote code execution, information disclosure, and denial-of-service attacks.
## 3. TECHNICAL DETAILS
## 3.1 AFFECTED PRODUCTS
Siemens reports these vulnerabilities affect the following SIMATIC Industri
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: Multiple heap out-of-bound writes in VNC client code (Incomplete fix for CVE-2018-20019)
vendor_redhat·2019-01-06·CVSS 9.8
CVE-2018-20748 [CRITICAL] CWE-416 libvncserver: Multiple heap out-of-bound writes in VNC client code (Incomplete fix for CVE-2018-20019)
libvncserver: Multiple heap out-of-bound writes in VNC client code (Incomplete fix for CVE-2018-20019)
LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.
Package: libvncserver (Red Hat Enterprise Linux 6) - Will not fix
Package: libvncserver (Red Hat Enterprise Linux 7) - Affected
Package: libvncserver (Red Hat Enterprise Linux 8) - Affected
Red Hat
libvncserver: Multiple heap out-of-bound writes in VNC client code
vendor_redhat·2018-12-19·CVSS 9.8
CVE-2018-20019 [CRITICAL] CWE-416 libvncserver: Multiple heap out-of-bound writes in VNC client code
libvncserver: Multiple heap out-of-bound writes in VNC client code
LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can result remote code execution
Package: libvncserver (Red Hat Enterprise Linux 6) - Will not fix
Package: libvncserver (Red Hat Enterprise Linux 7) - Affected
Package: libvncserver (Red Hat Enterprise Linux 8) - Affected
Debian
CVE-2018-20019: libvncserver - LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple ...
vendor_debian·2018·CVSS 9.8
CVE-2018-20019 [CRITICAL] CVE-2018-20019: libvncserver - LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple ...
LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can result remote code execution
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)
Debian
CVE-2018-20748: libvncserver - LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities ...
vendor_debian·2018·CVSS 9.8
CVE-2018-20748 [CRITICAL] CVE-2018-20748: libvncserver - LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities ...
LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.
Scope: local
bookworm: resolved (fixed in 0.9.11+dfsg-1.3)
bullseye: resolved (fixed in 0.9.11+dfsg-1.3)
forky: resolved (fixed in 0.9.11+dfsg-1.3)
sid: resolved (fixed in 0.9.11+dfsg-1.3)
trixie: resolved (fixed in 0.9.11+dfsg-1.3)
GHSA
GHSA-hgfp-cxw5-j4w8: LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can re
ghsa_unreviewed·2022-05-13
CVE-2018-20019 [CRITICAL] CWE-787 GHSA-hgfp-cxw5-j4w8: LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can re
LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can result remote code execution
GHSA
GHSA-vvj8-j245-7346: LibVNC before 0
ghsa_unreviewed·2022-05-13·CVSS 9.8
CVE-2018-20748 [CRITICAL] CWE-787 GHSA-vvj8-j245-7346: LibVNC before 0
LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.
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-2018-20748: LibVNC before 0
osv·2019-01-30·CVSS 9.8
CVE-2018-20748 [CRITICAL] CVE-2018-20748: LibVNC before 0
LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.
OSV
CVE-2018-20019: LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can re
osv·2018-12-19·CVSS 9.8
CVE-2018-20019 [CRITICAL] CVE-2018-20019: LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can re
LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can result remote code execution
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2018-20748 libvncserver: Multiple heap out-of-bound writes in VNC client code (Incomplete fix for CVE-2018-20019)
bugzilla·2019-01-31·CVSS 9.8
CVE-2018-20748 [CRITICAL] CVE-2018-20748 libvncserver: Multiple heap out-of-bound writes in VNC client code (Incomplete fix for CVE-2018-20019)
CVE-2018-20748 libvncserver: Multiple heap out-of-bound writes in VNC client code (Incomplete fix for CVE-2018-20019)
LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.
Upstream patch:
https://github.com/LibVNC/libvncserver/commit/a64c3b37af9a6c8f8009d7516874b8d266b42bae
https://github.com/LibVNC/libvncserver/commit/c2c4b81e6cb3b485fb1ec7ba9e7defeb889f6ba7
https://github.com/LibVNC/libvncserver/commit/c5ba3fee85a7ecbbca1df5ffd46d32b92757bc2a
https://github.com/LibVNC/libvncserver/commit/e34bcbb759ca5bef85809967a268fdf214c1ad2c
Upstream issue:
https://github.com/LibVNC/libvncserver/issues/273
Discussion:
Created libvncserver tracking bugs for this issue:
Affects: epel-7 [bug 1661116]
Bugzilla
CVE-2018-20019 CVE-2018-20748 CVE-2018-20749 CVE-2018-20750 libvncserver: various flaws [fedora-all]
bugzilla·2018-12-20·CVSS 9.8
CVE-2018-20019 [CRITICAL] CVE-2018-20019 CVE-2018-20748 CVE-2018-20749 CVE-2018-20750 libvncserver: various flaws [fedora-all]
CVE-2018-20019 CVE-2018-20748 CVE-2018-20749 CVE-2018-20750 libvncserver: various flaws [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.
NOTE: this issue affects mult
Bugzilla
CVE-2018-20019 libvncserver: Multiple heap out-of-bound writes in VNC client code
bugzilla·2018-12-20·CVSS 9.8
CVE-2018-20019 [CRITICAL] CVE-2018-20019 libvncserver: Multiple heap out-of-bound writes in VNC client code
CVE-2018-20019 libvncserver: Multiple heap out-of-bound writes in VNC client code
LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code, which can result in remote code execution. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in a83439b9fbe0f03c48eb94ed05729cb016f8b72f and later.
External Reference:
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-029-libvnc-multiple-heap-out-of-bound-vulnerabilities/
Upstream Patch:
https://github.com/LibVNC/libvncserver/commit/a83439b9fbe0f03c48eb94ed05729cb016f8b72f
Discussion:
Created libvncserver tracking bugs for this issue:
Affects: epel-7 [bug 1661116]
Affects: fedora-all
Bugzilla
CVE-2018-20019 CVE-2018-20748 CVE-2018-20749 CVE-2018-20750 libvncserver: various flaws [epel-7]
bugzilla·2018-12-20·CVSS 9.8
CVE-2018-20019 [CRITICAL] CVE-2018-20019 CVE-2018-20748 CVE-2018-20749 CVE-2018-20750 libvncserver: various flaws [epel-7]
CVE-2018-20019 CVE-2018-20748 CVE-2018-20749 CVE-2018-20750 libvncserver: various flaws [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.
Discussion:
Use the following templa
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdfhttps://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-029-libvnc-multiple-heap-out-of-bound-vulnerabilities/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://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdfhttps://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-029-libvnc-multiple-heap-out-of-bound-vulnerabilities/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