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
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
89.6%
Issue Overview:
A vulnerability was found in a previous version of mod_auth_mellon. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.(CVE-2019-3877)
A vulnerability was found in mod_auth_mellon. If Apache is configured as a reverse proxy and mod_auth_mellon is configured to only let through authenticated users (with the require valid-user directive), adding special HTTP headers that are normally used to start the special SAML ECP (non-browser based) can be used to bypass authentication.(CVE-2019-3878)
Affected Packages:
mod_auth_mellon
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update mod_auth_mellon to update your system.
New Packages:
aarch64:
mod_auth_mellon-0.14.0-2.amzn2.4.aarch64
mod_auth_mellon-debuginfo-0.14.0-2.amzn2.4.aarch64
mod_auth_mellon-diagnostics-0.14.0-2.amzn2.4.aarch64
i686:
mod_auth_mellon-0.14.0-2.amzn2.4.i686
mod_auth_mellon-debuginfo-0.14.0-2.amzn2.4.i686
mod_auth_mellon-diagnostics-0.14.0-2.amzn2.4.i686
src:
mod_auth_mellon-0.14.0-2.amzn2.4.src
x86_64:
mod_auth_mellon-0.14.0-2.amzn2.4.x86_64
mod_auth_mellon-debuginfo-0.14.0-2.amzn2.4.x86_64
mod_auth_mellon-diagnostics-0.14.0-2.amzn2.4.x86_64
Red Hat: CVE-2019-3877, CVE-2019-3878
Mitre: CVE-2019-3877, CVE-2019-3878
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
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
89.6%