Vulnerability Name:

CVE-2016-9952 (CCN-140467)

Assigned:2016-12-21
Published:2016-12-21
Updated:2018-04-10
Summary:The verify_certificate function in lib/vtls/schannel.c in libcurl 7.30.0 through 7.51.0, when built for Windows CE using the schannel TLS backend, makes it easier for remote attackers to conduct man-in-the-middle attacks via a crafted wildcard SAN in a server certificate, as demonstrated by "*.com."
CVSS v3 Severity:8.1 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
7.1 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/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): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
4.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)
3.8 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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): Required
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
4.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-295
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2016-9952

Source: CONFIRM
Type: Vendor Advisory
https://curl.haxx.se/CVE-2016-9952.patch

Source: CCN
Type: curl Web site
Win CE schannel cert wildcard matches too much

Source: CONFIRM
Type: Vendor Advisory
https://curl.haxx.se/docs/adv_20161221B.html

Source: XF
Type: UNKNOWN
libcurl-cve20169952-mitm(140467)

Vulnerable Configuration:Configuration 1:
  • cpe:/a:haxx:curl:*:*:*:*:*:*:*:* (Version >= 7.30.0 and <= 7.51.0)
  • AND
  • cpe:/o:microsoft:windows_ce:-:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.artful:def:20169952000
    V
    		CVE-2016-9952 on Ubuntu 17.10 (artful) - medium.
    2018-03-12
    oval:com.ubuntu.trusty:def:20169952000
    V
    		CVE-2016-9952 on Ubuntu 14.04 LTS (trusty) - medium.
    2018-03-12
    oval:com.ubuntu.xenial:def:20169952000
    V
    		CVE-2016-9952 on Ubuntu 16.04 LTS (xenial) - medium.
    2018-03-12
    oval:com.ubuntu.xenial:def:201699520000000
    V
    		CVE-2016-9952 on Ubuntu 16.04 LTS (xenial) - medium.
    2018-03-12
    BACK
    haxx curl *
    microsoft windows ce -