Integer overflow in Libvncserver Project
CVE-2018-7225
An issue was discovered in LibVNCServer through 0.9.11. rfbProcessClientNormalMessage() in rfbserver.c does not sanitize msg.cct.length, leading to access to uninitialized and potentially sensitive data or possibly unspecified other impact (e.g., an integer overflow) via specially crafted VNC packets.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.061 (93.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.061 · newest: 0.061 · change: 0.000
Affected products
- Libvncserver Project
- Canonical Ubuntu Linux — versions 14.04, 16.04, 17.10
- Debian Linux — versions 7.0, 8.0, 9.0
- Red Hat Enterprise Linux Desktop — versions 7.0
- Red Hat Enterprise Linux Server — versions 7.0
- Red Hat Enterprise Linux Server Aus — versions 7.6
- Red Hat Enterprise Linux Server Eus — versions 7.5, 7.6
- Red Hat Enterprise Linux Server Tus — versions 7.6
- Red Hat Enterprise Linux Workstation — versions 7.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.debian.org/security/2018/dsa-4221 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3618-1/ (vendor-advisory, Third Party Advisory)
- github.com/LibVNC/libvncserver/issues/218 (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2018/03/msg00035.html (mailing-list, Mailing List, Third Party Advisory)
- www.securityfocus.com/bid/103107 (VDB Entry, Third Party Advisory, vdb-entry)
- www.openwall.com/lists/oss-security/2018/02/18/1 (Exploit, Mailing List, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:1055 (vendor-advisory, Third Party Advisory)
- security.gentoo.org/glsa/201908-05 (vendor-advisory)
- lists.debian.org/debian-lts-announce/2019/10/msg00042.html (mailing-list)
- lists.debian.org/debian-lts-announce/2019/11/msg00032.html (mailing-list)
Frequently asked questions
- What is CVE-2018-7225?
- CVE-2018-7225 is a critical-severity vulnerability in Libvncserver Project, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2018-02-19.
- How severe is CVE-2018-7225?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2018-7225 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.