Vulnerability Name:

CVE-2020-10185 (CCN-177344)

Assigned:2020-03-03
Published:2020-03-03
Updated:2020-03-12
Summary:The sync endpoint in YubiKey Validation Server before 2.40 allows remote attackers to replay an OTP.
Note: this issue is potentially relevant to persons outside Yubico who operate a self-hosted OTP validation service with a non-default configuration such as an open sync pool; the issue does NOT affect YubiCloud.
CVSS v3 Severity:8.6 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H)
7.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H/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): Low
Integrity (I): Low
Availibility (A): High
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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): None
Integrity (I): Low
Availibility (A): None
CVSS v2 Severity:6.8 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-294
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2020-10185

Source: XF
Type: UNKNOWN
yubikey-cve202010185-sec-bypass(177344)

Source: MISC
Type: Release Notes, Third Party Advisory
https://github.com/Yubico/yubikey-val/releases/tag/yubikey-val-2.40

Source: MLIST
Type: UNKNOWN
[debian-lts-announce] 20200312 [SECURITY] [DLA 2141-1] yubikey-val security update

Source: CCN
Type: Yubico Security Advisory YSA-2020-01
insufficient data validation in yubikey-val

Source: MISC
Type: Exploit, Vendor Advisory
https://www.yubico.com/support/security-advisories/ysa-2020-01/

Vulnerable Configuration:Configuration 1:
  • cpe:/a:yubico:yubikey_one_time_password_validation_server:*:*:*:*:*:*:*:* (Version < 2.40)

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.bionic:def:2020101850000000
    V
    		CVE-2020-10185 on Ubuntu 18.04 LTS (bionic) - medium.
    2020-03-05
    oval:com.ubuntu.xenial:def:2020101850000000
    V
    		CVE-2020-10185 on Ubuntu 16.04 LTS (xenial) - medium.
    2020-03-05
    BACK
    yubico yubikey one time password validation server *