Critical severity · published Jan 30, 2019
CVE-2018-20748
LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c
9.8
CVSS
3.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.3% · higher than 89% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
8.0; 8.0 · source: NVD
LI
Libvncserver · Libvnc Project
before 0.9.12 · source: NVD
SI
Simatic Itc1500 Firmware · Siemens
3.0.0.0 before 3.2.1.0 · source: NVD
SI
Simatic Itc1500 Pro Firmware · Siemens
3.0.0.0 before 3.2.1.0 · source: NVD
SI
Simatic Itc1900 Firmware · Siemens
3.0.0.0 before 3.2.1.0 · source: NVD
SI
Simatic Itc1900 Pro Firmware · Siemens
3.0.0.0 before 3.2.1.0 · source: NVD
SI
Simatic Itc2200 Firmware · Siemens
3.0.0.0 before 3.2.1.0 · source: NVD
SI
Simatic Itc2200 Pro Firmware · Siemens
3.0.0.0 before 3.2.1.0 · source: NVD
UL
Ubuntu Linux · Canonical
14.04; 16.04; 18.04; 18.10 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-20748
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-20748
Patch
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
Patch
https://github.com/LibVNC/libvncserver/commit/a64c3b37af9a6c8f8009d7516874b8d266b42bae
Patch
https://github.com/LibVNC/libvncserver/commit/c2c4b81e6cb3b485fb1ec7ba9e7defeb889f6ba7
Patch
https://github.com/LibVNC/libvncserver/commit/c5ba3fee85a7ecbbca1df5ffd46d32b92757bc2a
Patch
https://github.com/LibVNC/libvncserver/commit/e34bcbb759ca5bef85809967a268fdf214c1ad2c
Issue Tracking
https://github.com/LibVNC/libvncserver/issues/273
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