Debian Security Advisory

DLA-637-1 openssl -- LTS security update

Date Reported:
25 Sep 2016
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2016-2177, CVE-2016-2178, CVE-2016-2179, CVE-2016-2180, CVE-2016-2181, CVE-2016-2182, CVE-2016-6302, CVE-2016-6303, CVE-2016-6304, CVE-2016-6306.
More information:

Several vulnerabilities were discovered in OpenSSL:

  • CVE-2016-2177

    Guido Vranken discovered that OpenSSL uses undefined pointer arithmetic. Additional information can be found at

  • CVE-2016-2178

    Cesar Pereida, Billy Brumley and Yuval Yarom discovered a timing leak in the DSA code.

  • CVE-2016-2179 / CVE-2016-2181

    Quan Luo and the OCAP audit team discovered denial of service vulnerabilities in DTLS.

  • CVE-2016-2180 / CVE-2016-2182 / CVE-2016-6303

    Shi Lei discovered an out-of-bounds memory read in TS_OBJ_print_bio() and an out-of-bounds write in BN_bn2dec() and MDC2_Update().

  • CVE-2016-2183

    DES-based cipher suites are demoted from the HIGH group to MEDIUM as a mitigation for the SWEET32 attack.

  • CVE-2016-6302

    Shi Lei discovered that the use of SHA512 in TLS session tickets is susceptible to denial of service.

  • CVE-2016-6304

    Shi Lei discovered that excessively large OCSP status request may result in denial of service via memory exhaustion.

  • CVE-2016-6306

    Shi Lei discovered that missing message length validation when parsing certificates may potentially result in denial of service.

For Debian 7 Wheezy, these problems have been fixed in version 1.0.1t-1+deb7u1.

We recommend that you upgrade your openssl and libssl1.0.0 packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: