High severity · published Jan 23, 2017
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…
7.9
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
XE
Xen · Xen
All versions, or not specified · source: NVD
XE
Xenserver · Citrix
6.0.2; 6.2.0; 6.5; 7.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-9379
CVE.org
https://www.cve.org/CVERecord?id=CVE-2016-9379
Third Party Advisory
http://www.securityfocus.com/bid/94473
Third Party Advisory
http://www.securitytracker.com/id/1037347
Patch
http://xenbits.xen.org/xsa/advisory-198.html
Patch
http://xenbits.xen.org/xsa/xsa198.patch
security.gentoo.org
https://security.gentoo.org/glsa/201612-56
Patch
https://support.citrix.com/article/CTX218775
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