The asn1_d2i_read_bio function in crypto/asn1/a_d2i_fp.c in OpenSSL before 0.9.8v, 1.0.0 before 1.0.0i, and 1.0.1 before 1.0.1a does not properly interpret integer data, which allows remote attackers to conduct buffer overflow attacks, and cause a denial of service (memory corruption) or possibly have unspecified other impact, via crafted DER data, as demonstrated by an X.509 certificate or an RSA public key.
Vulnerable Systems:
* OpenSSL before 0.9.8v, 1.0.0 before 1.0.0i, and 1.0.1 before 1.0.1a
A potentially exploitable vulnerability has been discovered in the OpenSSL
function asn1_d2i_read_bio.
Any application which uses BIO or FILE based functions to read untrusted DER
format data is vulnerable. Affected functions are of the form d2i_*_bio or
d2i_*_fp, for example d2i_X509_bio or d2i_PKCS12_fp.
Applications using the memory based ASN1 functions (d2i_X509, d2i_PKCS12 etc)
are not affected. In particular the SSL/TLS code of OpenSSL is *not* affected.
Applications only using the PEM routines are not affected.
S/MIME or CMS applications using the built in MIME parser SMIME_read_PKCS7 or
SMIME_read_CMS *are* affected.
The OpenSSL command line utility is also affected if used to process untrusted
data in DER format.
Vendor Status:
OpenSSL core team had issued an update for this vulnerability
