Vulnerability Name:

CVE-2020-29485 (CCN-193136)

Assigned:2020-12-15
Published:2020-12-15
Updated:2021-03-16
Summary:An issue was discovered in Xen 4.6 through 4.14.x. When acting upon a guest XS_RESET_WATCHES request, not all tracking information is freed. A guest can cause unbounded memory usage in oxenstored. This can lead to a system-wide DoS. Only systems using the Ocaml Xenstored implementation are vulnerable. Systems using the C Xenstored implementation are not vulnerable.
CVSS v3 Severity:5.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
4.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
6.2 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
5.4 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:4.9 Medium (CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
4.9 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-401
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2020-29485

Source: XF
Type: UNKNOWN
xen-cve202029485-dos(193136)

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2020-df772b417b

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2020-64859a826b

Source: DEBIAN
Type: Third Party Advisory
DSA-4812

Source: CCN
Type: Xen Security Advisory XSA-330
oxenstored memory leak in reset_watches

Source: MISC
Type: Patch, Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-330.txt

Vulnerable Configuration:Configuration 1:
  • cpe:/o:xen:xen:*:*:*:*:*:*:*:* (Version >= 4.6.0 and <= 4.14.0)

    • Configuration 2:
  • cpe:/o:debian:debian_linux:10.0:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/o:fedoraproject:fedora:32:*:*:*:*:*:*:*
  • OR cpe:/o:fedoraproject:fedora:33:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:xensource:xen:4.6:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.7:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.8:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.9:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.10:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.11:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.12:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.13:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    xen xen *
    debian debian linux 10.0
    fedoraproject fedora 32
    fedoraproject fedora 33
    xensource xen 4.6
    xensource xen 4.7
    xensource xen 4.8
    xensource xen 4.9
    xensource xen 4.10
    xensource xen 4.11
    xensource xen 4.12
    xensource xen 4.13