Vulnerability Name:

CVE-2020-15136 (CCN-186412)

Assigned:2020-08-05
Published:2020-08-05
Updated:2021-11-18
Summary:In ectd before versions 3.4.10 and 3.3.23, gateway TLS authentication is only applied to endpoints detected in DNS SRV records. When starting a gateway, TLS authentication will only be attempted on endpoints identified in DNS SRV records for a given domain, which occurs in the discoverEndpoints function. No authentication is performed against endpoints provided in the --endpoints flag. This has been fixed in versions 3.4.10 and 3.3.23 with improved documentation and deprecation of the functionality.
CVSS v3 Severity:6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): Low
Availibility (A): None
9.1 Critical (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N)
7.9 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
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): None
CVSS v2 Severity:5.8 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): None
9.4 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:C/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-306
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2020-15136

Source: XF
Type: UNKNOWN
etcd-cve202015136-sec-bypass(186412)

Source: MISC
Type: Broken Link
https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/gateway.md

Source: CCN
Type: etcd GIT Repository
Gateway TLS authentication only applies to endpoints detected in DNS SRV records

Source: CONFIRM
Type: Third Party Advisory
https://github.com/etcd-io/etcd/security/advisories/GHSA-wr2v-9rpq-c35q

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2020-cd43b84c16

Vulnerable Configuration:Configuration 1:
  • cpe:/a:redhat:etcd:*:*:*:*:*:*:*:* (Version >= 3.3.0 and < 3.3.23)
  • OR cpe:/a:redhat:etcd:*:*:*:*:*:*:*:* (Version >= 3.4.0 and < 3.4.10)

    • Configuration 2:
  • cpe:/o:fedoraproject:fedora:32:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    redhat etcd *
    redhat etcd *
    fedoraproject fedora 32