CVE-2017-5337

Multiple heap-based buffer overflows in the read_attribute function in GnuTLS before 3.3.26 and 3.5.x before 3.5.8 allow remote attackers to have unspecified impact via a crafted OpenPGP certificate.

Remote denial of service in SSL alert handling. (CVE-2016-8610)

In gnutls_x509_ext_import_proxy: if the language was set but the policy wasn't, that could lead to a double free. (CVE-2017-5334)

Decoding a specially crafted OpenPGP certificate could have lead to heap and stack overflows. (CVE-2017-5335, CVE-2017-5336 and CVE-2017-5337)

This update for gnutls fixes the following issues:

• Malformed asn1 definitions could cause a segmentation fault in the asn1 definition parser (bsc#961491).
• CVE-2016-8610: Remote denial of service in SSL alert handling (bsc#1005879).
• CVE-2017-5335: Decoding a specially crafted OpenPGP certificate could have lead to heap and stack overflows (bsc#1018832).
• CVE-2017-5336: Decoding a specially crafted OpenPGP certificate could have lead to heap and stack overflows (bsc#1018832).
• CVE-2017-5337: Decoding a specially crafted OpenPGP certificate could have lead to heap and stack overflows (bsc#1018832).

This update for gnutls fixes the following security issues:

• GnuTLS could have crashed when processing maliciously crafted OpenPGP certificates (GNUTLS-SA-2017-2, bsc#1018832, CVE-2017-5335, CVE-2017-5337, CVE-2017-5336)
• GnuTLS could have falsely accepted certificates when using OCSP (GNUTLS-SA-2016-3, bsc#999646, CVE-2016-7444)
• GnuTLS could have suffered from 100% CPU load DoS attacks by using SSL alert packets during the handshake (bsc#1005879, CVE-2016-8610)

Stefan Buehler discovered that GnuTLS incorrectly verified the serial length of OCSP responses. A remote attacker could possibly use this issue to bypass certain certificate validation measures. This issue only applied to Ubuntu 16.04 LTS. (CVE-2016-7444)

Shi Lei discovered that GnuTLS incorrectly handled certain warning alerts. A remote attacker could possibly use this issue to cause GnuTLS to hang, resulting in a denial of service. This issue has only been addressed in Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-8610)

It was discovered that GnuTLS incorrectly decoded X.509 certificates with a Proxy Certificate Information extension. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2017-5334)

It was discovered that GnuTLS incorrectly handled certain OpenPGP certificates. A remote attacker could possibly use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2017-5335, CVE-2017-5336, CVE-2017-5337)