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This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.
The OCSP functionality in stunnel before 4.24 does not properly search certificate revocation lists (CRL), which allows remote attackers to bypass intended access restrictions by using revoked certificates.
Source: MITRE View Analysis Description
Source: MITRE
Base Score: 6.8 MEDIUM Vector: (AV:N/AC:M/Au:N/C:P/I:P/A:P) (V2 legend) Impact Subscore: 6.4 Exploitability Subscore: 8.6
Access Vector (AV): Network Access Complexity (AC): Medium Authentication (AU): None Confidentiality (C): Partial Integrity (I): Partial Availability (A): Partial Additional Information: Provides unauthorized accessAllows unauthorized disclosure of informationAllows disruption of service
Not vulnerable. OCSP protocol support was only implemented in upstream stunnel version 4.16. Therefore OCSP protocol is not available in the versions of stunnel as shipped with Red Hat Enterprise Linux 2.1, 3, 4, or 5.
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Vulnerability Type (View All)
https://exchange.xforce.ibmcloud.com/vulnerabilities/42528 [No Types Assigned]
http://xforce.iss.net/xforce/xfdb/42528 [No Types Assigned]