CVE-2015-0208: Null Pointer Dereference
The ASN.1 signature-verification implementation in the rsaitemverify function in crypto/rsa/rsaameth.c in OpenSSL 1.0.2 before 1.0.2a allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via crafted RSA PSS parameters to an endpoint that uses the certificate-verification feature.
Other sources
The signature verification routines will crash with a NULL pointer dereference if presented with an ASN.1 signature using the RSA PSS algorithm and invalid parameters. Since these routines are used to verify certificate signature algorithms, this flaw can be used to crash any certificate verification operation and exploited in a DoS attack. Any application which performs certificate verification is vulnerable including OpenSSL clients and servers which enable client authentication.
This issue affects OpenSSL versions 1.0.2, and is fixed in version 1.0.2a.
Acknowledgements:
Red Hat would like to thank the OpenSSL project for reporting this issue. Upstream acknowledges Stephen Henson of the OpenSSL development team as the original reporter.
— Red Hat
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2015-0208?
CVE-2015-0208 has a severity of medium due to its potential to cause denial of service through a crash.
How do I fix CVE-2015-0208?
To fix CVE-2015-0208, upgrade to OpenSSL version 1.0.2a or later.
Which versions of OpenSSL are affected by CVE-2015-0208?
CVE-2015-0208 affects OpenSSL versions 1.0.2 and all its beta versions prior to 1.0.2a.
Can CVE-2015-0208 be exploited remotely?
Yes, CVE-2015-0208 can be exploited remotely by sending crafted RSA PSS parameters.
What impact does CVE-2015-0208 have on applications using OpenSSL?
Applications using vulnerable versions of OpenSSL may experience crashes due to NULL pointer dereference.