Improper input validation in Citrix Xenserver
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 class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.9 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Citrix Xenserver — versions 6.0.2, 6.2.0, 6.5
- Xen
Weakness classification (CWE)
References
- xenbits.xen.org/xsa/xsa198.patch (Patch, Vendor Advisory)
- www.securityfocus.com/bid/94473 (VDB Entry, Third Party Advisory, vdb-entry)
- security.gentoo.org/glsa/201612-56 (vendor-advisory)
- xenbits.xen.org/xsa/advisory-198.html (Patch, Vendor Advisory)
- www.securitytracker.com/id/1037347 (VDB Entry, Third Party Advisory, vdb-entry)
- support.citrix.com/article/CTX218775 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2016-9379?
- CVE-2016-9379 is a high-severity vulnerability in Citrix Xenserver, classified under Improper Input Validation. CVSS score: 7.9/10. Published 2017-01-23.
- How severe is CVE-2016-9379?
- High severity. CVSS v3 base score is 7.9 out of 10.