CVE-2018-20748

high-risk
Published 2019-01-30

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.

Do I need to act?

!
10.6% chance of exploitation in next 30 days
EPSS score — higher than 89% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (12)

Affected Vendors

Debian Siemens Canonical Libvnc Project

References (24)

Patch https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
Patch https://github.com/LibVNC/libvncserver/commit/a64c3b37af9a6c8f8009d7516874b8d266...
Patch https://github.com/LibVNC/libvncserver/commit/c2c4b81e6cb3b485fb1ec7ba9e7defeb88...
Patch https://github.com/LibVNC/libvncserver/commit/c5ba3fee85a7ecbbca1df5ffd46d32b927...
Patch https://github.com/LibVNC/libvncserver/commit/e34bcbb759ca5bef85809967a268fdf214...
Issue Tracking https://github.com/LibVNC/libvncserver/issues/273
Mailing List https://lists.debian.org/debian-lts-announce/2019/01/msg00029.html
Mailing List https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
Third Party Advisory https://usn.ubuntu.com/3877-1/
Third Party Advisory https://usn.ubuntu.com/4547-1/
Third Party Advisory https://usn.ubuntu.com/4587-1/
Exploit https://www.openwall.com/lists/oss-security/2018/12/10/8
Patch https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
Patch https://github.com/LibVNC/libvncserver/commit/a64c3b37af9a6c8f8009d7516874b8d266...
Patch https://github.com/LibVNC/libvncserver/commit/c2c4b81e6cb3b485fb1ec7ba9e7defeb88...
Patch https://github.com/LibVNC/libvncserver/commit/c5ba3fee85a7ecbbca1df5ffd46d32b927...
Patch https://github.com/LibVNC/libvncserver/commit/e34bcbb759ca5bef85809967a268fdf214...
Issue Tracking https://github.com/LibVNC/libvncserver/issues/273
Mailing List https://lists.debian.org/debian-lts-announce/2019/01/msg00029.html
Mailing List https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
and 4 more references
60
/ 100
high-risk
Severity 32/34 · Critical
Exploitability 11/34 · Low
Exposure 17/34 · Moderate