Debian Security Advisory

DLA-456-1 openssl -- LTS security update

Date Reported:
03 May 2016
Affected Packages:
openssl
Vulnerable:
Yes
Security database references:
In Mitre's CVE dictionary: CVE-2016-2105, CVE-2016-2106, CVE-2016-2107, CVE-2016-2108, CVE-2016-2109, CVE-2016-2176.
More information:

Several vulnerabilities were discovered in OpenSSL, a Secure Socket Layer toolkit.

  • CVE-2016-2105

    Guido Vranken discovered that an overflow can occur in the function EVP_EncodeUpdate(), used for Base64 encoding, if an attacker can supply a large amount of data. This could lead to a heap corruption.

  • CVE-2016-2106

    Guido Vranken discovered that an overflow can occur in the function EVP_EncryptUpdate() if an attacker can supply a large amount of data. This could lead to a heap corruption.

  • CVE-2016-2107

    Juraj Somorovsky discovered a padding oracle in the AES CBC cipher implementation based on the AES-NI instruction set. This could allow an attacker to decrypt TLS traffic encrypted with one of the cipher suites based on AES CBC.

  • CVE-2016-2108

    David Benjamin from Google discovered that two separate bugs in the ASN.1 encoder, related to handling of negative zero integer values and large universal tags, could lead to an out-of-bounds write.

  • CVE-2016-2109

    Brian Carpenter discovered that when ASN.1 data is read from a BIO using functions such as d2i_CMS_bio(), a short invalid encoding can casuse allocation of large amounts of memory potentially consuming excessive resources or exhausting memory.

  • CVE-2016-2176

    Guido Vranken discovered that ASN.1 Strings that are over 1024 bytes can cause an overread in applications using the X509_NAME_oneline() function on EBCDIC systems. This could result in arbitrary stack data being returned in the buffer.

Additional information about these issues can be found in the OpenSSL security advisory at https://www.openssl.org/news/secadv/20160503.txt

For Debian 6 Squeeze, these issues have been fixed in openssl version 1.0.1e-2+deb7u21