Vulnerability Details : CVE-2016-9379
The pygrub boot loader emulator in Xen, when S-expression output format is requested, allows local pygrub-using guest OS administrators to read or delete arbitrary files on the host via string quotes and S-expressions in the bootloader configuration file.
Vulnerability category: Input validation
Products affected by CVE-2016-9379
- cpe:2.3:a:citrix:xenserver:6.2.0:*:*:*:*:*:*:*
- cpe:2.3:a:citrix:xenserver:6.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:citrix:xenserver:7.0:*:*:*:*:*:*:*
- cpe:2.3:a:citrix:xenserver:6.5:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2016-9379
0.06%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 24 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2016-9379
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.6
|
MEDIUM | AV:L/AC:L/Au:N/C:P/I:P/A:P |
3.9
|
6.4
|
NIST | |
|
7.9
|
HIGH | CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N |
1.5
|
5.8
|
NIST |
CWE ids for CVE-2016-9379
-
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.Assigned by: nvd@nist.gov (Primary)
References for CVE-2016-9379
-
https://support.citrix.com/article/CTX218775
Citrix XenServer Multiple Security UpdatesPatch;Third Party Advisory
-
http://xenbits.xen.org/xsa/xsa198.patch
Patch;Vendor Advisory
-
http://www.securitytracker.com/id/1037347
Xen pygrub Validation Flaws Let Local Users on the Guest System Obtain Potentially Sensitive Information from or Deny Service on the Host System - SecurityTrackerThird Party Advisory;VDB Entry
-
http://www.securityfocus.com/bid/94473
Xen PyGrub Multiple Privilege Escalation VulnerabilitiesThird Party Advisory;VDB Entry
-
http://xenbits.xen.org/xsa/advisory-198.html
XSA-198 - Xen Security AdvisoriesPatch;Vendor Advisory
-
https://security.gentoo.org/glsa/201612-56
Xen: Multiple vulnerabilities (GLSA 201612-56) — Gentoo security
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