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Vulnerability Details : CVE-2020-25595

An issue was discovered in Xen through 4.14.x. The PCI passthrough code improperly uses register data. Code paths in Xen's MSI handling have been identified that act on unsanitized values read back from device hardware registers. While devices strictly compliant with PCI specifications shouldn't be able to affect these registers, experience shows that it's very common for devices to have out-of-spec "backdoor" operations that can affect the result of these reads. A not fully trusted guest may be able to crash Xen, leading to a Denial of Service (DoS) for the entire system. Privilege escalation and information leaks cannot be excluded. All versions of Xen supporting PCI passthrough are affected. Only x86 systems are vulnerable. Arm systems are not vulnerable. Only guests with passed through PCI devices may be able to leverage the vulnerability. Only systems passing through devices with out-of-spec ("backdoor") functionality can cause issues. Experience shows that such out-of-spec functionality is common; unless you have reason to believe that your device does not have such functionality, it's better to assume that it does.
Publish Date : 2020-09-23 Last Update Date : 2020-11-11
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- CVSS Scores & Vulnerability Types

CVSS Score
6.1
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of ServiceObtain Information
CWE ID 269

- Products Affected By CVE-2020-25595

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 10.0 * * * Version Details Vulnerabilities
2 OS Fedoraproject Fedora 32 * * * Version Details Vulnerabilities
3 OS Fedoraproject Fedora 33 * * * Version Details Vulnerabilities
4 OS Opensuse Leap 15.2 * * * Version Details Vulnerabilities
5 OS XEN XEN * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 1
Fedoraproject Fedora 2
Opensuse Leap 1
XEN XEN 1

- References For CVE-2020-25595

https://xenbits.xen.org/xsa/advisory-337.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4JRXMKEMQRQYWYEPHVBIWUEAVQ3LU4FN/
FEDORA FEDORA-2020-306b84fd07
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DA633Y3G5KX7MKRN4PFEGM3IVTJMBEOM/
FEDORA FEDORA-2020-f668e579be
https://www.debian.org/security/2020/dsa-4769
DEBIAN DSA-4769
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00008.html
SUSE openSUSE-SU-2020:1608
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RJZERRBJN6E6STDCHT4JHP4MI6TKBCJE/
FEDORA FEDORA-2020-d46fe34349
https://security.gentoo.org/glsa/202011-06
GENTOO GLSA-202011-06

- Metasploit Modules Related To CVE-2020-25595

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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