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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.

Note: although an application using the SSL/TLS portions of OpenSSL is not
automatically affected it might still call a function such as d2i_X509_bio on
untrusted data and be vulnerable.

Thanks to Tavis Ormandy, Google Security Team, for discovering this issue and
to Adam Langley <agl@chromium.org>for fixing it.

Affected users should upgrade to OpenSSL 1.0.1a, 1.0.0i or 0.9.8v.

References

URL for this Security Advisory:
http://www.openssl.org/news/secadv\_20120419.txt

(from redmine: issue id 1110, created on 2012-04-20, closed on 2012-05-07)

• Changesets:
  • Revision ae618760 by Natanael Copa on 2012-04-23T11:02:45Z:

main/openssl: security upgrade to 1.0.0i (CVE-2012-2110)

fixes #1110