Mandriva Linux Security Advisory 2015-072 - Suman Jana reported a vulnerability that affects the certificate verification functions of gnutls 3.1.x and gnutls 3.2.x. A version 1 intermediate certificate will be considered as a CA certificate by default. It was discovered that GnuTLS did not correctly handle certain errors that could occur during the verification of an X.509 certificate, causing it to incorrectly report a successful verification. An attacker could use this flaw to create a specially crafted certificate that could be accepted by GnuTLS as valid for a site chosen by the attacker. A NULL pointer dereference flaw was discovered in GnuTLS's gnutls_x509_dn_oid_name(). The function, when called with the GNUTLS_X509_DN_OID_RETURN_OID flag, should not return NULL to its caller. However, it could previously return NULL when parsed X.509 certificates included specific OIDs. A flaw was found in the way GnuTLS parsed session ids from Server Hello packets of the TLS/SSL handshake. A malicious server could use this flaw to send an excessively long session id value and trigger a buffer overflow in a connecting TLS/SSL client using GnuTLS, causing it to crash or, possibly, execute arbitrary code. An out-of-bounds memory write flaw was found in the way GnuTLS parsed certain ECC certificates or certificate signing requests. A malicious user could create a specially crafted ECC certificate or a certificate signing request that, when processed by an application compiled against GnuTLS (for example, certtool), could cause that application to crash or execute arbitrary code with the permissions of the user running the application.
d54e07c39568448fc8ce57614a5d9fa432224b556e5e7e077010ba9803d59272Mandriva Linux Security Advisory 2014-215 - An out-of-bounds memory write flaw was found in the way GnuTLS parsed certain ECC (Elliptic Curve Cryptography) certificates or certificate signing requests (CSR). A malicious user could create a specially crafted ECC certificate or a certificate signing request that, when processed by an application compiled against GnuTLS (for example, certtool), could cause that application to crash or execute arbitrary code with the permissions of the user running the application.
09deb94573db19c2095367b2e4855204d2d7f1f688124b59ab0810ec5e393e7aRed Hat Security Advisory 2014-1846-01 - The GnuTLS library provides support for cryptographic algorithms and for protocols such as Transport Layer Security. The gnutls packages also include the libtasn1 library, which provides Abstract Syntax Notation One parsing and structures management, and Distinguished Encoding Rules encoding and decoding functions. An out-of-bounds memory write flaw was found in the way GnuTLS parsed certain ECC certificates or certificate signing requests. A malicious user could create a specially crafted ECC certificate or a certificate signing request that, when processed by an application compiled against GnuTLS, could cause that application to crash or execute arbitrary code with the permissions of the user running the application.
d7b6ca9e01cfaf62474c6861a3613f29e538664ff430547cb7f087092a159e7bUbuntu Security Notice 2403-1 - Sean Burford discovered that GnuTLS incorrectly handled printing certain elliptic curve parameters. A malicious remote server or client could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code.
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