Vulnerability Name:

CVE-2021-26906 (CCN-197032)

Assigned:2020-12-04
Published:2020-12-04
Updated:2021-02-24
Summary:An issue was discovered in res_pjsip_session.c in Digium Asterisk through 13.38.1; 14.x, 15.x, and 16.x through 16.16.0; 17.x through 17.9.1; and 18.x through 18.2.0, and Certified Asterisk through 16.8-cert5. An SDP negotiation vulnerability in PJSIP allows a remote server to potentially crash Asterisk by sending specific SIP responses that cause an SDP negotiation failure.
CVSS v3 Severity:5.9 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
5.2 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/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): High
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:4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
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-404
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-26906

Source: MISC
Type: Third Party Advisory
http://packetstormsecurity.com/files/161477/Asterisk-Project-Security-Advisory-AST-2021-005.html

Source: FULLDISC
Type: Mailing List, Patch, Third Party Advisory
20210218 AST-2021-005: Remote Crash Vulnerability in PJSIP channel driver

Source: MISC
Type: Vendor Advisory
https://downloads.asterisk.org/pub/security/

Source: CCN
Type: Asterisk Project Security Advisory - AST-2021-005
Remote Crash Vulnerability in PJSIP channel driver

Source: CONFIRM
Type: Vendor Advisory
https://downloads.asterisk.org/pub/security/AST-2021-005.html

Source: XF
Type: UNKNOWN
asterisk-cve202126906-dos(197032)

Source: CONFIRM
Type: Issue Tracking, Patch, Vendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29196

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2021-26906

Vulnerable Configuration:Configuration 1:
  • cpe:/a:digium:asterisk:*:*:*:*:*:*:*:* (Version >= 13.0.0 and < 13.38.2)
  • OR cpe:/a:digium:asterisk:*:*:*:*:*:*:*:* (Version >= 16.0.0 and < 16.16.1)
  • OR cpe:/a:digium:asterisk:*:*:*:*:*:*:*:* (Version >= 17.0.0 and < 17.9.2)
  • OR cpe:/a:digium:asterisk:*:*:*:*:*:*:*:* (Version >= 18.0 and < 18.2.1)
  • OR cpe:/a:digium:certified_asterisk:16.8:-:*:*:*:*:*:*
  • OR cpe:/a:digium:certified_asterisk:16.8:cert1-rc1:*:*:*:*:*:*
  • OR cpe:/a:digium:certified_asterisk:16.8:cert1-rc2:*:*:*:*:*:*
  • OR cpe:/a:digium:certified_asterisk:16.8:cert1-rc3:*:*:*:*:*:*
  • OR cpe:/a:digium:certified_asterisk:16.8:cert1-rc4:*:*:*:*:*:*
  • OR cpe:/a:digium:certified_asterisk:16.8:cert2:*:*:*:*:*:*
  • OR cpe:/a:digium:certified_asterisk:16.8:cert3:*:*:*:*:*:*
  • OR cpe:/a:digium:certified_asterisk:16.8:cert4:*:*:*:*:*:*
  • OR cpe:/a:digium:certified_asterisk:16.8:cert4-rc1:*:*:*:*:*:*
  • OR cpe:/a:digium:certified_asterisk:16.8:cert4-rc2:*:*:*:*:*:*
  • OR cpe:/a:digium:certified_asterisk:16.8:cert4-rc3:*:*:*:*:*:*
  • OR cpe:/a:digium:certified_asterisk:16.8:cert4-rc4:*:*:*:*:*:*
  • OR cpe:/a:digium:certified_asterisk:16.8:cert5:*:*:*:*:*:*

  • * Denotes that component is vulnerable
    BACK
    digium asterisk *
    digium asterisk *
    digium asterisk *
    digium asterisk *
    digium certified asterisk 16.8 -
    digium certified asterisk 16.8 cert1-rc1
    digium certified asterisk 16.8 cert1-rc2
    digium certified asterisk 16.8 cert1-rc3
    digium certified asterisk 16.8 cert1-rc4
    digium certified asterisk 16.8 cert2
    digium certified asterisk 16.8 cert3
    digium certified asterisk 16.8 cert4
    digium certified asterisk 16.8 cert4-rc1
    digium certified asterisk 16.8 cert4-rc2
    digium certified asterisk 16.8 cert4-rc3
    digium certified asterisk 16.8 cert4-rc4
    digium certified asterisk 16.8 cert5