Redhat.comRH:CVE-2021-28834CVE-2021-28834
6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.02 Low
EPSS
Percentile
88.9%
A flaw was found in rubygem-kramdown. Rouge is a syntax highlighter used by kramdown. Restriction of the Rouge formatters to the Rouge::Formatters namespace does not occur when Ruby’s const_get() method is called. This can lead to arbitrary classes being instantiated in situations where the application using kramdown, for example, accepts user input to select a Rogue syntax highlighter formatter. The highest threat from this vulnerability when exploited in a vulnerable configuration is to data confidentiality, integrity, and availability.
Mitigation
Developers using rubygem-kramdown: Do not pass user or external input into custom Rouge formatter selection logic.
All other users/system administrators: There is no known mitigation at this time.
Related
6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.02 Low
EPSS
Percentile
88.9%