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Vigil@nce - GnuTLS: use after free via CRL
June 2015 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker can force the usage of a freed memory area in CRL of
GnuTLS, in order to trigger a denial of service, and possibly to
execute code.
Impacted products: Unix (platform)
Severity: 2/4
Creation date: 15/04/2015
DESCRIPTION OF THE VULNERABILITY
The GnuTLS product manages CRL.
However, the gnutls_x509_ext_import_crl_dist_points() function
frees a memory area before reusing it.
An attacker can therefore force the usage of a freed memory area
with a CRL for GnuTLS, in order to trigger a denial of service,
and possibly to execute code.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
http://vigilance.fr/vulnerability/GnuTLS-use-after-free-via-CRL-16623
