CVE-2020-5390
Public on
Last Modified:
Description
A verification flaw was found in python-pysaml2, where it did not check that the signature in a SAML document was enveloped, which enabled XML signature wrapping (XSW) attacks. A remote attacker could exploit this flaw to convince SAML processing to verify the signature and accept malicious data. This issue specifically affects the verification of signed SAML assertions.
Statement
All versions of Red Hat OpenStack Platform ship but do not use the flawed check-signature functionality of python-pysaml2. The impact for these products is therefore rated as having a security impact of Low and no update will be provided at this time for the impacted RHOSP packages.
Mitigation
There is no known mitigation for this issue, the flaw can only be resolved by applying updates.
Additional information
- Bugzilla 1794740: python-pysaml2: does not check that the signature in a SAML document is enveloped
- CWE-347: Improper Verification of Cryptographic Signature
- FAQ: Frequently asked questions about CVE-2020-5390
Common Vulnerability Scoring System (CVSS) Score Details
Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
Red Hat | NVD | |
---|---|---|
CVSS v3 Base Score | 7.5 | 7.5 |
Attack Vector | Network | Network |
Attack Complexity | Low | Low |
Privileges Required | None | None |
User Interaction | None | None |
Scope | Unchanged | Unchanged |
Confidentiality Impact | None | None |
Integrity Impact | High | High |
Availability Impact | None | None |
CVSS v3 Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Frequently Asked Questions
Why is Red Hat's CVSS v3 score or Impact different from other vendors?
My product is listed as "Under investigation" or "Affected", when will Red Hat release a fix for this vulnerability?
What can I do if my product is listed as "Will not fix"?
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What is a mitigation?
I have a Red Hat product but it is not in the above list, is it affected?
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My product is listed as "Out of Support Scope". What does this mean?
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