Vulnerability Details : CVE-2018-9918
libqpdf.a in QPDF through 8.0.2 mishandles certain "expected dictionary key but found non-name object" cases, allowing remote attackers to cause a denial of service (stack exhaustion), related to the QPDFObjectHandle and QPDF_Dictionary classes, because nesting in direct objects is not restricted.
Vulnerability category: Denial of service
Products affected by CVE-2018-9918
- 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:17.10:*:*:*:*:*:*:*
- cpe:2.3:a:qpdf_project:qpdf:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-9918
0.50%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 77 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-9918
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.8
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:P/A:P |
8.6
|
6.4
|
NIST | |
|
7.8
|
HIGH | CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST |
CWE ids for CVE-2018-9918
-
The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-9918
-
https://github.com/qpdf/qpdf/commit/b4d6cf6836ce025ba1811b7bbec52680c7204223
Limit depth of nesting in direct objects (fixes #202) · qpdf/qpdf@b4d6cf6 · GitHubPatch
-
https://github.com/qpdf/qpdf/issues/202
Segmentation Fault (stack exhaustion) on a crafted PDF file · Issue #202 · qpdf/qpdf · GitHubExploit;Issue Tracking;Patch;Third Party Advisory
-
https://usn.ubuntu.com/3638-1/
USN-3638-1: QPDF vulnerabilities | Ubuntu security noticesThird Party Advisory
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