CVE-2016-9379

Description

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.

CVSS Metrics

• v3.0•HIGH•Score: 7.9CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
• v2.0•MEDIUM•Score: 4.6AV:L/AC:L/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 0.10%• Percentile: 27%

Techniques & Countermeasures

• CWE-20•Improper Input Validation

  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.

Affected Systems

• citrix•xenserver

  6.0.2 | 6.2.0 | 6.5 | 7.0

References (6)

• http://xenbits.xen.org/xsa/xsa198.patch
• http://www.securityfocus.com/bid/94473
• https://security.gentoo.org/glsa/201612-56
• http://xenbits.xen.org/xsa/advisory-198.html
• http://www.securitytracker.com/id/1037347
• https://support.citrix.com/article/CTX218775