Vulnerability Name:

CVE-2021-4209 (CCN-232960)

Assigned:2022-01-24
Published:2022-01-24
Updated:2022-10-27
Summary:A NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.
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
CVSS v2 Severity: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-2021-4209

Source: MISC
Type: Third Party Advisory
https://access.redhat.com/security/cve/CVE-2021-4209

Source: CCN
Type: Red Hat Bugzilla - Bug 2044156
CVE-2021-4209 GnuTLS: Null pointer dereference in MD_UPDATE

Source: MISC
Type: Issue Tracking, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2044156

Source: XF
Type: UNKNOWN
gnutls-cve20214209-dos(232960)

Source: MISC
Type: Patch, Third Party Advisory
https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568

Source: MISC
Type: Third Party Advisory
https://gitlab.com/gnutls/gnutls/-/issues/1306

Source: CCN
Type: GnuTLS GIT Repository
wrap_nettle_hash_fast: avoid calling _update with zero-length input

Source: MISC
Type: Third Party Advisory
https://gitlab.com/gnutls/gnutls/-/merge_requests/1503

Source: CONFIRM
Type: Third Party Advisory
https://security.netapp.com/advisory/ntap-20220915-0005/

Vulnerable Configuration:Configuration 1:
  • cpe:/a:gnu:gnutls:*:*:*:*:*:*:*:* (Version < 3.7.3)

    • Configuration 2:
  • cpe:/o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/a:netapp:solidfire_&_hci_management_node:-:*:*:*:*:*:*:*
  • OR cpe:/a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*

    • Configuration 4:
  • cpe:/a:netapp:hci_bootstrap_os:-:*:*:*:*:*:*:*
  • AND
  • cpe:/h:netapp:hci_compute_node:-:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:958
    P
    		Security update for gnutls (Moderate)
    2022-03-04
    oval:org.opensuse.security:def:99216
    P
    		 (Moderate)
    2022-03-04
    oval:org.opensuse.security:def:100423
    P
    		 (Moderate)
    2022-03-04
    oval:org.opensuse.security:def:42205
    P
    		Security update for gnutls (Moderate)
    2022-03-04
    oval:org.opensuse.security:def:99490
    P
    		 (Moderate)
    2022-03-04
    oval:org.opensuse.security:def:100757
    P
    		 (Moderate)
    2022-03-04
    oval:org.opensuse.security:def:42348
    P
    		Security update for gnutls (Moderate)
    2022-03-04
    oval:org.opensuse.security:def:99752
    P
    		 (Moderate)
    2022-03-04
    oval:org.opensuse.security:def:119129
    P
    		Security update for gnutls (Moderate)
    2022-03-04
    oval:org.opensuse.security:def:101650
    P
    		Security update for gnutls (Moderate)
    2022-03-04
    oval:org.opensuse.security:def:100085
    P
    		 (Moderate)
    2022-03-04
    oval:org.opensuse.security:def:6175
    P
    		Security update for gnutls (Moderate)
    2022-03-02
    oval:org.opensuse.security:def:6176
    P
    		Security update for gnutls (Moderate)
    2022-03-02
    oval:org.opensuse.security:def:5356
    P
    		Security update for gnutls (Moderate)
    2022-03-02
    BACK
    gnu gnutls *
    redhat enterprise linux 8.0
    netapp solidfire & hci management node -
    netapp active iq unified manager -
    netapp hci bootstrap os -
    netapp hci compute node -