Vulnerability Name:

CVE-2018-20684 (CCN-155485)

Assigned:2019-01-10
Published:2019-01-10
Updated:2020-01-15
Summary:In WinSCP before 5.14 beta, due to missing validation, the scp implementation would accept arbitrary files sent by the server, potentially overwriting unrelated files. This affects TSCPFileSystem::SCPSink in core/ScpFileSystem.cpp.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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): None
Integrity (I): High
Availibility (A): None
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/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): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:6.4 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): Partial
4.9 Medium (CCN CVSS v2 Vector: AV:N/AC:H/Au:S/C:N/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): High
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-20
Vulnerability Consequences:File Manipulation
References:Source: MITRE
Type: CNA
CVE-2018-20684

Source: CCN
Type: WinSCP Web Site
WinSCP

Source: BID
Type: Third Party Advisory, VDB Entry
106526

Source: XF
Type: UNKNOWN
winscp-cve201820684-file-overwrite(155485)

Source: CCN
Type: WinSCP GIT Repository
Bug 1675: Prevent SCP server sending files that were not requested

Source: MISC
Type: Patch, Third Party Advisory
https://github.com/winscp/winscp/commit/49d876f2c5fc00bcedaa986a7cf6dedd6bf16f54

Source: CCN
Type: oss-sec Mailing List, Mon, 14 Jan 2019 09:51:43 +0200 (EET)
SCP client multiple vulnerabilities

Source: MISC
Type: Mitigation, Third Party Advisory
https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt

Source: MISC
Type: Release Notes, Vendor Advisory
https://winscp.net/eng/docs/history

Source: MISC
Type: Patch, Vendor Advisory
https://winscp.net/tracker/1675

Source: MISC
Type: UNKNOWN
https://www.oracle.com/security-alerts/cpujan2020.html

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2018-20684

Vulnerable Configuration:Configuration 1:
  • cpe:/a:winscp:winscp:*:*:*:*:*:*:*:* (Version <= 5.13.7)

    • Configuration CCN 1:
  • cpe:/a:winscp:winscp:5.9.1:*:*:*:*:*:*:*
  • OR cpe:/a:winscp:winscp:5.13.5:*:*:*:*:*:*:*
  • OR cpe:/a:winscp:winscp:5.7.6:*:*:*:*:*:*:*
  • OR cpe:/a:winscp:winscp:5.7.4:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    winscp winscp *
    winscp winscp 5.9.1
    winscp winscp 5.13.5
    winscp winscp 5.7.6
    winscp winscp 5.7.4