Vulnerability Name:

CVE-2021-26813 (CCN-197676)

Assigned:2021-01-20
Published:2021-01-20
Updated:2022-05-23
Summary:markdown2 >=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.
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)
6.6 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:P/RL:W/RC:R)
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)
6.6 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:P/RL:W/RC:R)
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-Other
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-26813

Source: XF
Type: UNKNOWN
pythonmarkdown2-cve202126813-dos(197676)

Source: CCN
Type: python-markdown2 GIT Repository
Regex DOS fixes #387

Source: MISC
Type: Exploit, Third Party Advisory
https://github.com/trentm/python-markdown2/pull/387

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2021-0337384e41

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2021-77191478ad

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2021-e235a0da4a

Vulnerable Configuration:Configuration 1:
  • cpe:/a:markdown2_project:markdown2:*:*:*:*:*:*:*:* (Version >= 1.0.1.18 and < 2.4.0)

    • Configuration 2:
  • cpe:/o:fedoraproject:fedora:32:*:*:*:*:*:*:*
  • OR cpe:/o:fedoraproject:fedora:33:*:*:*:*:*:*:*
  • OR cpe:/o:fedoraproject:fedora:34:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:python-markdown2_project:python-markdown2:1.0.1.18:*:*:*:*:*:*:*
  • OR cpe:/a:python-markdown2_project:python-markdown2:1.0.1.17:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:113272
    P
    		python36-markdown2-2.4.0-2.4 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:106684
    P
    		python36-markdown2-2.4.0-2.4 on GA media (Moderate)
    2021-10-01
    oval:org.opensuse.security:def:11187
    P
    		Security update for python-markdown2 (Moderate)
    2021-03-20
    oval:org.opensuse.security:def:96456
    P
    		Security update for python-markdown2 (Moderate)
    2021-03-20
    oval:org.opensuse.security:def:103146
    P
    		Security update for python-markdown2 (Moderate)
    2021-03-20
    oval:org.opensuse.security:def:109803
    P
    		Security update for python-markdown2 (Moderate)
    2021-03-20
    oval:org.opensuse.security:def:111273
    P
    		Security update for python-markdown2 (Moderate)
    2021-03-16
    BACK
    markdown2_project markdown2 *
    fedoraproject fedora 32
    fedoraproject fedora 33
    fedoraproject fedora 34
    python-markdown2_project python-markdown2 1.0.1.18
    python-markdown2_project python-markdown2 1.0.1.17