Vulnerability Name:

CVE-2021-33656 (CCN-231423)

Assigned:2021-01-05
Published:2021-01-05
Updated:2022-10-29
Summary:When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.
CVSS v3 Severity:6.8 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
5.9 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Physical
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
6.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H)
5.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): Low
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:6.4 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:P/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-787
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2021-33656

Source: MLIST
Type: Mailing List, Patch, Third Party Advisory
[oss-security] 20220719 CVE-2021-33656: Linux kernel: When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.(<5.10.127)

Source: XF
Type: UNKNOWN
linux-kernel-cve202133656-code-exec(231423)

Source: CCN
Type: Kernel GIT Repository
vt-drop-old-font-ioctls.patch

Source: MISC
Type: Patch, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20221002 [SECURITY] [DLA 3131-1] linux security update

Source: CCN
Type: IBM Security Bulletin 7007837 (Cloud Pak for Watson AIOps)
Multiple Vulnerabilities in CloudPak for Watson AIOPs

Source: CCN
Type: Openeuler Web site
CVE-2021-33656

Source: MISC
Type: Third Party Advisory
https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel

Vulnerable Configuration:Configuration 1:
  • cpe:/o:huawei:openeuler:20.03:sp3:*:*:lts:*:*:*
  • OR cpe:/o:huawei:openeuler:20.03:sp1:*:*:lts:*:*:*
  • OR cpe:/o:huawei:openeuler:20.03:-:*:*:lts:*:*:*

    • Configuration 2:
  • cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version < 5.10.127)

    • Configuration 3:
  • cpe:/o:debian:debian_linux:10.0:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:-:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:4739
    P
    		Security update for the Linux Kernel (Important)
    2022-08-26
    oval:org.opensuse.security:def:707
    P
    		Security update for the Linux Kernel (Important)
    2022-08-23
    oval:org.opensuse.security:def:697
    P
    		Security update for the Linux Kernel (Important)
    2022-08-16
    oval:org.opensuse.security:def:125119
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:118235
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:127340
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:119287
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:125388
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:118655
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:119468
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:125778
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:118792
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:119653
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:126942
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:118982
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:4302
    P
    		Security update for the Linux Kernel (Important)
    2022-08-09
    oval:org.opensuse.security:def:6135
    P
    		Security update for the Linux Kernel (Important)
    2022-08-09
    oval:org.opensuse.security:def:4665
    P
    		Security update for the Linux Kernel (Important)
    2022-08-09
    oval:org.opensuse.security:def:6136
    P
    		Security update for the Linux Kernel (Important)
    2022-08-09
    oval:org.opensuse.security:def:6350
    P
    		Security update for the Linux Kernel (Important)
    2022-08-09
    oval:org.opensuse.security:def:5322
    P
    		Security update for the Linux Kernel (Important)
    2022-08-09
    BACK
    huawei openeuler 20.03 sp3
    huawei openeuler 20.03 sp1
    huawei openeuler 20.03 -
    linux linux kernel *
    debian debian linux 10.0
    linux linux kernel -