Vulnerability Name:

CVE-2021-20177 (CCN-194619)

Assigned:2020-12-17
Published:2021-01-12
Updated:2021-06-02
Summary:A flaw was found in the Linux kernel's implementation of string matching within a packet. A privileged user (with root or CAP_NET_ADMIN) when inserting iptables rules could insert a rule which can panic the system. Kernel before kernel 5.5-rc1 is affected.
CVSS v3 Severity:4.4 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H)
3.9 Low (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/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): High
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
5.5 Medium (CCN 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 (CCN 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
CVSS v2 Severity:2.1 Low (CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
4.6 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-125
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-20177

Source: CCN
Type: Red Hat Bugzilla - Bug 1914719
(CVE-2021-20177) - CVE-2021-20177 kernel: iptables string match rule could result in kernel panic

Source: MISC
Type: Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1914719

Source: XF
Type: UNKNOWN
linux-kernel-cve202120177-dos(194619)

Source: CCN
Type: Linux Kernel GIT Repository
netfilter: add and use nf_hook_slow_list()

Source: CCN
Type: oss-sec Mailing List, Tue, 12 Jan 2021 16:58:07 +1000
CVE-2021-20177 kernel: iptables string match rule could result in kernel panic

Vulnerable Configuration:Configuration 1:
  • cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version <= 5.4.9)

  • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:8029
    P
    kernel-docs-5.14.21-150500.53.2 on GA media (Moderate)
    2023-06-20
    oval:org.opensuse.security:def:7539
    P
    kernel-64kb-5.14.21-150500.53.2 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:7576
    P
    libblkid-devel-2.37.4-150500.7.16 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:7713
    P
    log4j-2.17.2-150200.4.24.13 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:8090
    P
    reiserfs-kmp-default-5.14.21-150500.53.2 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:665
    P
    Security update for samba (Moderate)
    2022-08-03
    oval:org.opensuse.security:def:93154
    P
    (Important)
    2022-07-12
    oval:org.opensuse.security:def:93307
    P
    (Important)
    2022-07-06
    oval:org.opensuse.security:def:3453
    P
    clamav-0.101.3-1.19 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3516
    P
    gtk2-data-2.24.31-9.6.28 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3567
    P
    libXtst6-1.2.2-7.1 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3398
    P
    wpa_supplicant-2.6-15.10.1 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3448
    P
    busybox-1.21.1-3.3 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:95412
    P
    Security update for rubygem-rack (Critical)
    2022-06-27
    oval:org.opensuse.security:def:95028
    P
    kernel-docs-5.14.21-150400.22.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:95078
    P
    reiserfs-kmp-default-5.14.21-150400.22.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:94628
    P
    libcaca-devel-0.99.beta19.git20171003-150200.11.6.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:2960
    P
    kernel-64kb-5.14.21-150400.22.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:95083
    P
    kernel-azure-5.14.21-150400.12.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:94925
    P
    libXcursor1-32bit-1.1.15-1.18 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:94590
    P
    kernel-64kb-5.14.21-150400.22.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:95197
    P
    kernel-default-extra-5.14.21-150400.22.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:95423
    P
    Security update for MozillaThunderbird (Important)
    2022-06-13
    oval:org.opensuse.security:def:89
    P
    kernel-64kb-5.3.18-57.3 on GA media (Moderate)
    2022-06-13
    oval:org.opensuse.security:def:100104
    P
    (Important)
    2022-03-24
    oval:org.opensuse.security:def:101638
    P
    Security update for xerces-j2 (Important)
    2022-02-18
    oval:org.opensuse.security:def:99199
    P
    (Moderate)
    2022-01-20
    oval:org.opensuse.security:def:102125
    P
    Security update for the Linux Kernel (Important)
    2022-01-11
    oval:org.opensuse.security:def:4516
    P
    Security update for the Linux Kernel (Live Patch 20 for SLE 12 SP5) (Important)
    2021-11-17
    oval:org.opensuse.security:def:102299
    P
    Security update for the Linux Kernel (Important)
    2021-11-11
    oval:org.opensuse.security:def:102136
    P
    Security update for python (Moderate)
    2021-10-20
    oval:org.opensuse.security:def:5875
    P
    Security update for libvirt (Moderate)
    2021-10-04
    oval:org.opensuse.security:def:5864
    P
    Security update for ghostscript (Critical)
    2021-09-21
    oval:org.opensuse.security:def:2036
    P
    kernel-azure-5.3.18-36.1 on GA media (Moderate)
    2021-08-10
    oval:org.opensuse.security:def:63102
    P
    reiserfs-kmp-default-5.3.18-57.3 on GA media (Moderate)
    2021-08-10
    oval:org.opensuse.security:def:101341
    P
    apache2-mod_apparmor-2.13.6-1.31 on GA media (Moderate)
    2021-08-10
    oval:org.opensuse.security:def:63125
    P
    kernel-azure-5.3.18-36.1 on GA media (Moderate)
    2021-08-10
    oval:org.opensuse.security:def:2013
    P
    reiserfs-kmp-default-5.3.18-57.3 on GA media (Moderate)
    2021-08-10
    oval:org.opensuse.security:def:63019
    P
    kernel-docs-5.3.18-57.3 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:71848
    P
    kernel-64kb-5.3.18-57.3 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:100865
    P
    kernel-64kb-5.3.18-57.3 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:1018
    P
    kernel-64kb-5.3.18-57.3 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:72738
    P
    kernel-docs-5.3.18-57.3 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:101277
    P
    kernel-docs-5.3.18-57.3 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:1930
    P
    kernel-docs-5.3.18-57.3 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:62107
    P
    kernel-64kb-5.3.18-57.3 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:99394
    P
    (Important)
    2021-07-12
    oval:org.opensuse.security:def:9644
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:92054
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:98506
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:92842
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:105196
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:68102
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:9843
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:92249
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:69784
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:98836
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:93001
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:8893
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:91541
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:99593
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:10394
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:92444
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:97227
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:69983
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:99004
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:9088
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:91886
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:7013
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:99792
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:92643
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:8330
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:70534
    P
    Security update for the Linux Kernel (Important)
    2021-02-19
    oval:org.opensuse.security:def:4731
    P
    Security update for the Linux Kernel (Important)
    2021-02-11
    oval:org.opensuse.security:def:21843
    P
    Security update for the Linux Kernel (Important)
    2021-02-11
    oval:org.opensuse.security:def:68802
    P
    Security update for the Linux Kernel (Important)
    2021-02-10
    oval:org.opensuse.security:def:95965
    P
    Security update for the Linux Kernel (Important)
    2021-02-10
    oval:org.opensuse.security:def:102678
    P
    Security update for the Linux Kernel (Important)
    2021-02-10
    oval:org.opensuse.security:def:118435
    P
    Security update for the Linux Kernel (Important)
    2021-02-10
    oval:org.opensuse.security:def:109344
    P
    Security update for the Linux Kernel (Important)
    2021-02-10
    oval:org.opensuse.security:def:35275
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:95908
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:109664
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:74673
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:108791
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:102621
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:97175
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:7195
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:118373
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:65605
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:4283
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:26157
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:60403
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:109287
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:8372
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:70804
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:117818
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:19615
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:76021
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:108802
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:97177
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:66953
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:34569
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:61098
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:95586
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:108007
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:6459
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:68284
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:117888
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:96182
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:20533
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:76032
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:108965
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:102872
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:118634
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:66964
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:5144
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:34580
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:95761
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:109538
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:73727
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:108304
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:102474
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:68665
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:118063
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:64605
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:96326
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:60392
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:109140
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:10664
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:102998
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:119804
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:67548
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:117521
    P
    Security update for the Linux Kernel (Important)
    2021-02-09
    oval:org.opensuse.security:def:111205
    P
    Security update for the Linux Kernel (Important)
    2021-02-05
    BACK
    linux linux kernel *