Vulnerability Name:

CVE-2017-17850 (CCN-136631)

Assigned:2017-12-12
Published:2017-12-12
Updated:2018-11-25
Summary:An issue was discovered in Asterisk 13.18.4 and older, 14.7.4 and older, 15.1.4 and older, and 13.18-cert1 and older. A select set of SIP messages create a dialog in Asterisk. Those SIP messages must contain a contact header. For those messages, if the header was not present and the PJSIP channel driver was used, Asterisk would crash. The severity of this vulnerability is somewhat mitigated if authentication is enabled. If authentication is enabled, a user would have to first be authorized before reaching the crash point.
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:N/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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): None
Integrity (I): None
Availibility (A): High
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-20
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2017-17850

Source: CCN
Type: Asterisk Project Security Advisory - AST-2017-014
Crash in PJSIP resource when missing a contact header

Source: CONFIRM
Type: Vendor Advisory
http://downloads.asterisk.org/pub/security/AST-2017-014.html

Source: SECTRACK
Type: Third Party Advisory, VDB Entry
1040056

Source: XF
Type: UNKNOWN
asterisk-cve201717850-dos(136631)

Source: CONFIRM
Type: Issue Tracking, Vendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-27480

Source: GENTOO
Type: UNKNOWN
GLSA-201811-11

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2017-17850

Vulnerable Configuration:Configuration 1:
  • cpe:/a:digium:asterisk:*:*:*:*:*:*:*:* (Version >= 13.0.0 and <= 13.18.4)

    • Configuration 2:
  • cpe:/a:digium:asterisk:*:*:*:*:*:*:*:* (Version >= 14.0.0 and <= 14.7.4)

    • Configuration 3:
  • cpe:/a:digium:asterisk:*:*:*:*:*:*:*:* (Version >= 15.0.0 and <= 15.1.4)

    • Configuration 4:
  • cpe:/a:digium:certified_asterisk:13.1.0:*:*:*:*:*:*:*
  • OR cpe:/a:digium:certified_asterisk:13.1.0:rc1:*:*:*:*:*:*
  • OR cpe:/a:digium:certified_asterisk:13.1.0:rc2:*:*:*:*:*:*
  • OR cpe:/a:digium:certified_asterisk:13.8:cert1:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.xenial:def:2017178500000000
    V
    		CVE-2017-17850 on Ubuntu 16.04 LTS (xenial) - low.
    2017-12-27
    oval:com.ubuntu.artful:def:201717850000
    V
    		CVE-2017-17850 on Ubuntu 17.10 (artful) - untriaged.
    2017-12-27
    oval:com.ubuntu.xenial:def:201717850000
    V
    		CVE-2017-17850 on Ubuntu 16.04 LTS (xenial) - low.
    2017-12-27
    oval:com.ubuntu.disco:def:2017178500000000
    V
    		CVE-2017-17850 on Ubuntu 19.04 (disco) - low.
    2017-12-27
    oval:com.ubuntu.bionic:def:201717850000
    V
    		CVE-2017-17850 on Ubuntu 18.04 LTS (bionic) - low.
    2017-12-27
    oval:com.ubuntu.cosmic:def:2017178500000000
    V
    		CVE-2017-17850 on Ubuntu 18.10 (cosmic) - low.
    2017-12-27
    oval:com.ubuntu.cosmic:def:201717850000
    V
    		CVE-2017-17850 on Ubuntu 18.10 (cosmic) - low.
    2017-12-27
    oval:com.ubuntu.bionic:def:2017178500000000
    V
    		CVE-2017-17850 on Ubuntu 18.04 LTS (bionic) - low.
    2017-12-27
    oval:com.ubuntu.trusty:def:201717850000
    V
    		CVE-2017-17850 on Ubuntu 14.04 LTS (trusty) - low.
    2017-12-27
    BACK
    digium asterisk *
    digium asterisk *
    digium asterisk *
    digium certified asterisk 13.1.0
    digium certified asterisk 13.1.0 rc1
    digium certified asterisk 13.1.0 rc2
    digium certified asterisk 13.8 cert1