VulnerabilityModified
CVE-2016-9380
The pygrub boot loader emulator in Xen, when nul-delimited output format is requested, allows local pygrub-using guest OS administrators to read or delete arbitrary files on the host via NUL bytes in the bootloader configuration file.
HIGH 7.5EPSS 0.42%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.42%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
The pygrub boot loader emulator in Xen, when nul-delimited output format is requested, allows local pygrub-using guest OS administrators to read or delete arbitrary files on the host via NUL bytes in the bootloader configuration file.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
- EPSS
- 0.42% probability · 36th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- xen/xen · citrix/xenserver
- Source
- cve@mitre.org
References
- http://www.securityfocus.com/bid/94473Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037347Third Party Advisory, VDB Entry
- http://xenbits.xen.org/xsa/advisory-198.htmlPatch, Vendor Advisory
- http://xenbits.xen.org/xsa/xsa198.patchPatch, Vendor Advisory
- https://security.gentoo.org/glsa/201612-56
- https://support.citrix.com/article/CTX218775Patch, Third Party Advisory
- http://www.securityfocus.com/bid/94473Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037347Third Party Advisory, VDB Entry
- http://xenbits.xen.org/xsa/advisory-198.htmlPatch, Vendor Advisory
- http://xenbits.xen.org/xsa/xsa198.patchPatch, Vendor Advisory
- https://security.gentoo.org/glsa/201612-56
- https://support.citrix.com/article/CTX218775Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.