Vulnerability Name:

CVE-2020-28242 (CCN-191389)

Assigned:2020-11-05
Published:2020-11-05
Updated:2022-06-05
Summary:An issue was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1 and Certified Asterisk before 16.8-cert5. If Asterisk is challenged on an outbound INVITE and the nonce is changed in each response, Asterisk will continually send INVITEs in a loop. This causes Asterisk to consume more and more memory since the transaction will never terminate (even if the call is hung up), ultimately leading to a restart or shutdown of Asterisk. Outbound authentication must be configured on the endpoint for this to occur.
CVSS v3 Severity:6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/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): Low
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:4.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): Single_Instance
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-674
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2020-28242

Source: CCN
Type: Asterisk Project Security Advisory - AST-2020-002
Outbound INVITE loop on challenge with different nonce

Source: MISC
Type: Vendor Advisory
http://downloads.asterisk.org/pub/security/AST-2020-002.html

Source: XF
Type: UNKNOWN
asterisk-cve202028242-dos(191389)

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20220403 [SECURITY] [DLA 2969-1] asterisk security update

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2020-6b277646c7

Vulnerable Configuration:Configuration 1:
  • cpe:/a:asterisk:open_source:*:*:*:*:*:*:*:* (Version >= 18.0 and < 18.0.1)
  • OR cpe:/a:asterisk:open_source:*:*:*:*:*:*:*:* (Version >= 17.0 and < 17.8.1)
  • OR cpe:/a:asterisk:open_source:*:*:*:*:*:*:*:* (Version >= 16.0 and < 16.14.1)
  • OR cpe:/a:asterisk:open_source:*:*:*:*:*:*:*:* (Version >= 13.0 and < 13.37.1)
  • OR cpe:/a:asterisk:certified_asterisk:*:*:*:*:*:*:*:* (Version <= 16.8.0)

    • Configuration 2:
  • cpe:/o:fedoraproject:fedora:33:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    asterisk open source *
    asterisk open source *
    asterisk open source *
    asterisk open source *
    asterisk certified asterisk *
    fedoraproject fedora 33
    debian debian linux 9.0