Vulnerability Details : CVE-2018-20750
Potential exploit
LibVNC through 0.9.12 contains a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The fix for CVE-2018-15127 was incomplete.
Vulnerability category: Memory Corruption
Products affected by CVE-2018-20750
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_itc1500_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_itc1500_pro_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_itc1900_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_itc1900_pro_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_itc2200_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_itc2200_pro_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
- cpe:2.3:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-20750
0.45%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 75 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-20750
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST | |
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST |
CWE ids for CVE-2018-20750
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-20750
-
http://www.securityfocus.com/bid/106825
LibVNCServer Incomplete Fix Multiple Heap Buffer Overflow VulnerabilitiesBroken Link
-
https://github.com/LibVNC/libvncserver/issues/273
SECURITY: malloc((uint64_t)length + 1) is unsafe, especially on 32-bit systems · Issue #273 · LibVNC/libvncserver · GitHubIssue Tracking;Third Party Advisory
-
https://usn.ubuntu.com/4587-1/
USN-4587-1: iTALC vulnerabilities | Ubuntu security notices | UbuntuThird Party Advisory
-
https://www.openwall.com/lists/oss-security/2018/12/10/8
oss-security - Re: libvnc and tightvnc vulnerabilitiesExploit;Mailing List;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
[SECURITY] [DLA 1979-1] italc security updateMailing List;Third Party Advisory
-
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
Patch;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2019/01/msg00029.html
[SECURITY] [DLA 1652-1] libvncserver security updateMailing List;Third Party Advisory
-
https://usn.ubuntu.com/4547-1/
USN-4547-1: iTALC vulnerabilities | Ubuntu security notices | UbuntuThird Party Advisory
-
https://usn.ubuntu.com/3877-1/
USN-3877-1: LibVNCServer vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://github.com/LibVNC/libvncserver/commit/09e8fc02f59f16e2583b34fe1a270c238bd9ffec
Limit lenght to INT_MAX bytes in rfbProcessFileTransferReadBuffer() · LibVNC/libvncserver@09e8fc0 · GitHubPatch;Third Party Advisory
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