Vulnerability Name:

CVE-2019-18835 (CCN-171192)

Assigned:2019-10-28
Published:2019-10-28
Updated:2020-08-24
Summary:Matrix Synapse before 1.5.0 mishandles signature checking on some federation APIs. Events sent over /send_join, /send_leave, and /invite may not be correctly signed, or may not come from the expected servers.
CVSS v3 Severity:9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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): High
Integrity (I): High
Availibility (A): High
3.7 Low (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N)
3.2 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/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): High
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:7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
2.6 Low (CCN CVSS v2 Vector: AV:N/AC:H/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): High
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-345
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2019-18835

Source: XF
Type: UNKNOWN
matrix-cve201918835-sec-bypass(171192)

Source: CCN
Type: Synapse GIT Repository
Improve signature checking on some federation APIs #6262

Source: MISC
Type: Patch, Third Party Advisory
https://github.com/matrix-org/synapse/pull/6262

Source: MISC
Type: Release Notes, Third Party Advisory
https://github.com/matrix-org/synapse/releases/tag/v1.5.0

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2019-18835

Vulnerable Configuration:Configuration 1:
  • cpe:/a:matrix:synapse:*:*:*:*:*:*:*:* (Version < 1.5.0)

    • Configuration CCN 1:
  • cpe:/a:matrix:synapse:1.4.1:-:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    matrix synapse *
    matrix synapse 1.4.1 -