Vulnerability Name:

CVE-2021-37750 (CCN-208020)

Assigned:2021-08-19
Published:2021-08-19
Updated:2022-10-25
Summary:The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.
CVSS v3 Severity:6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/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): Network
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
6.5 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/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): Network
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
6.5 Medium (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/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): Network
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:4.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
6.8 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-476
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-37750

Source: XF
Type: UNKNOWN
mitkerberos-cve202137750-dos(208020)

Source: CCN
Type: krb5 GIT Repository
Fix KDC null deref on TGS inner body null server

Source: CONFIRM
Type: Patch, Third Party Advisory
https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49

Source: MISC
Type: Release Notes, Third Party Advisory
https://github.com/krb5/krb5/releases

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20210930 [SECURITY] [DLA 2771-1] krb5 security update

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2021-f2c8514f02

Source: CONFIRM
Type: Third Party Advisory
https://security.netapp.com/advisory/ntap-20210923-0002/

Source: MISC
Type: Vendor Advisory
https://web.mit.edu/kerberos/advisories/

Source: CCN
Type: IBM Security Bulletin 6551876 (Cloud Pak for Security)
Cloud Pak for Security uses packages that are vulnerable to multiple CVEs

Source: CCN
Type: IBM Security Bulletin 6568365 (QRadar Network Packet Capture)
IBM QRadar Network Packet Capture is using components with known vulnerabilities

Source: CCN
Type: IBM Security Bulletin 6619835 (PowerSC)
Vulnerability in MIT Kerberos 5 affects PowerSC (CVE-2021-37750)

Source: CCN
Type: Oracle CPUJul2022
Oracle Critical Patch Update Advisory - July 2022

Source: N/A
Type: Patch, Third Party Advisory
N/A

Source: MISC
Type: Third Party Advisory
https://www.starwindsoftware.com/security/sw-20220817-0004/

Vulnerable Configuration:Configuration 1:
  • cpe:/a:mit:kerberos_5:*:*:*:*:*:*:*:* (Version >= 1.19.0 and < 1.19.3)
  • OR cpe:/a:mit:kerberos_5:*:*:*:*:*:*:*:* (Version < 1.18.5)

    • Configuration 2:
  • cpe:/o:fedoraproject:fedora:33:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*

    • Configuration 4:
  • cpe:/a:starwindsoftware:starwind_virtual_san:v8r13:14338:*:*:*:*:*:*

    • Configuration 5:
  • cpe:/a:oracle:communications_cloud_native_core_network_slice_selection_function:22.1.0:*:*:*:*:*:*:*

    • Configuration RedHat 1:
  • cpe:/o:redhat:enterprise_linux:8:*:*:*:*:*:*:*

    • Configuration RedHat 2:
  • cpe:/o:redhat:enterprise_linux:8::baseos:*:*:*:*:*

    • Configuration RedHat 3:
  • cpe:/o:redhat:enterprise_linux:7:*:*:*:*:*:*:*

    • Configuration RedHat 4:
  • cpe:/o:redhat:enterprise_linux:7::client:*:*:*:*:*

    • Configuration RedHat 5:
  • cpe:/o:redhat:enterprise_linux:7::computenode:*:*:*:*:*

    • Configuration RedHat 6:
  • cpe:/o:redhat:enterprise_linux:7::server:*:*:*:*:*

    • Configuration RedHat 7:
  • cpe:/o:redhat:enterprise_linux:7::workstation:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:mit:kerberos_5:1.18:*:*:*:*:*:*:*
  • AND
  • cpe:/a:ibm:qradar_network_packet_capture:7.3:*:*:*:*:*:*:*
  • OR cpe:/a:ibm:cloud_pak_for_security:1.7.2.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:8060
    P
    		policycoreutils-devel-3.1-150400.1.5 on GA media (Moderate)
    2023-06-20
    oval:org.opensuse.security:def:7994
    P
    		bsdtar-3.5.1-150400.3.12.1 on GA media (Moderate)
    2023-06-20
    oval:org.opensuse.security:def:7543
    P
    		krb5-1.20.1-150500.1.2 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:790
    P
    		Security update for cosign (Important)
    2022-10-01
    oval:org.opensuse.security:def:95410
    P
    		Security update for nodejs16 (Important)
    2022-07-21
    oval:org.opensuse.security:def:3503
    P
    		gnome-keyring-3.20.0-28.3.18 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3691
    P
    		libudisks2-0-2.1.3-3.5.1 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3483
    P
    		eog-3.20.4-7.7 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:95113
    P
    		krb5-plugin-kdb-ldap-1.19.2-150400.1.9 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:94615
    P
    		libXrender-devel-0.9.10-1.30 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:2963
    P
    		krb5-1.19.2-150400.1.9 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:94593
    P
    		krb5-1.19.2-150400.1.9 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:102123
    P
    		Security update for amazon-ssm-agent (Important) (in QA)
    2022-04-26
    oval:org.opensuse.security:def:6203
    P
    		Security update for kernel-firmware (Moderate)
    2022-03-21
    oval:org.opensuse.security:def:112519
    P
    		krb5-1.19.2-2.2 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:42228
    P
    		Security update for krb5 (Moderate)
    2021-12-06
    oval:com.redhat.rhsa:def:20214788
    P
    		RHSA-2021:4788: krb5 security update (Moderate)
    2021-11-23
    oval:org.opensuse.security:def:111106
    P
    		Security update for krb5 (Moderate)
    2021-10-31
    oval:org.opensuse.security:def:66951
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:108789
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:76360
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:5862
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:111750
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:42130
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:67292
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:73714
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:109431
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:117508
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:1637
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:64592
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:102765
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:69083
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:73902
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:118527
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:96075
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:64780
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:107994
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:102213
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:69149
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:76019
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:101328
    P
    		Security update for krb5 (Moderate)
    2021-10-18
    oval:org.opensuse.security:def:106010
    P
    		krb5-1.19.2-2.2 on GA media (Moderate)
    2021-10-01
    oval:com.redhat.rhsa:def:20213576
    P
    		RHSA-2021:3576: krb5 security update (Moderate)
    2021-09-21
    BACK
    mit kerberos 5 *
    mit kerberos 5 *
    fedoraproject fedora 33
    debian debian linux 9.0
    starwindsoftware starwind virtual san v8r13 14338
    oracle communications cloud native core network slice selection function 22.1.0
    mit kerberos 5 1.18
    ibm qradar network packet capture 7.3
    ibm cloud pak for security 1.7.2.0