Vulnerability Name:

CVE-2018-12434 (CCN-144862)

Assigned:2018-06-13
Published:2018-06-13
Updated:2018-08-06
Summary:LibreSSL before 2.6.5 and 2.7.x before 2.7.4 allows a memory-cache side-channel attack on DSA and ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover a key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.
CVSS v3 Severity:4.7 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N)
4.1 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): None
Availibility (A): None
5.1 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)
4.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): None
Availibility (A): None
CVSS v2 Severity:1.9 Low (CVSS v2 Vector: AV:L/AC:M/Au:N/C:P/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
4.0 Medium (CCN CVSS v2 Vector: AV:L/AC:H/Au:N/C:C/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): High
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): None
Availibility (A): None
Vulnerability Type:CWE-200
Vulnerability Consequences:Obtain Information
References:Source: MITRE
Type: CNA
CVE-2018-12434

Source: CCN
Type: LibreSSL Web site
LibreSSL

Source: XF
Type: UNKNOWN
libressl-cve201812434-info-disc(144862)

Source: MISC
Type: Vendor Advisory
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.6.5-relnotes.txt

Source: MISC
Type: Vendor Advisory
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.4-relnotes.txt

Source: CCN
Type: nccgroup Web site
Technical Advisory: "ROHNP"- Key Extraction Side Channel in Multiple Crypto Libraries

Source: MISC
Type: Third Party Advisory
https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/

Vulnerable Configuration:Configuration 1:
  • cpe:/a:openbsd:libressl:*:*:*:*:*:*:*:* (Version < 2.6.5)
  • OR cpe:/a:openbsd:libressl:2.7.0:*:*:*:*:*:*:*
  • OR cpe:/a:openbsd:libressl:2.7.1:*:*:*:*:*:*:*
  • OR cpe:/a:openbsd:libressl:2.7.2:*:*:*:*:*:*:*
  • OR cpe:/a:openbsd:libressl:2.7.3:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:201812434
    V
    		CVE-2018-12434
    2022-09-02
    oval:org.opensuse.security:def:112613
    P
    		libcrypto46-3.3.4-1.2 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:106097
    P
    		libcrypto46-3.3.4-1.2 on GA media (Moderate)
    2021-10-01
    BACK
    openbsd libressl *
    openbsd libressl 2.7.0
    openbsd libressl 2.7.1
    openbsd libressl 2.7.2
    openbsd libressl 2.7.3