[IT-SecNots] [SECURITY] [DSA 3500-1] openssl security update

[Alessandro Ghedini <ghedo AT debian.org>]

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Debian Security Advisory DSA-3500-1                   security AT debian.org
https://www.debian.org/security/                       Alessandro Ghedini
March 01, 2016                        https://www.debian.org/security/faq
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Package        : openssl
CVE ID         : CVE-2016-0702 CVE-2016-0705 CVE-2016-0797 CVE-2016-0798
                 CVE-2016-0799

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

CVE-2016-0702

    Yuval Yarom from the University of Adelaide and NICTA, Daniel Genkin
    from Technion and Tel Aviv University, and Nadia Heninger from the
    University of Pennsylvania discovered a side-channel attack which
    makes use of cache-bank conflicts on the Intel Sandy-Bridge
    microarchitecture. This could allow local attackers to recover RSA
    private keys.

CVE-2016-0705

    Adam Langley from Google discovered a double free bug when parsing
    malformed DSA private keys. This could allow remote attackers to
    cause a denial of service or memory corruption in applications
    parsing DSA private keys received from untrusted sources.

CVE-2016-0797

    Guido Vranken discovered an integer overflow in the BN_hex2bn and
    BN_dec2bn functions that can lead to a NULL pointer dereference and
    heap corruption. This could allow remote attackers to cause a denial
    of service or memory corruption in applications processing hex or
    dec data received from untrusted sources.

CVE-2016-0798

    Emilia Käsper of the OpenSSL development team discovered a memory
    leak in the SRP database lookup code. To mitigate the memory leak,
    the seed handling in SRP_VBASE_get_by_user is now disabled even if
    the user has configured a seed. Applications are advised to migrate
    to the SRP_VBASE_get1_by_user function.

CVE-2016-0799

    Guido Vranken discovered an integer overflow in the BIO_*printf
    functions that could lead to an OOB read when printing very long
    strings. Additionally the internal doapr_outch function can attempt
    to write to an arbitrary memory location in the event of a memory
    allocation failure. These issues will only occur on platforms where
    sizeof(size_t) > sizeof(int) like many 64 bit systems. This could
    allow remote attackers to cause a denial of service or memory
    corruption in applications that pass large amounts of untrusted data
    to the BIO_*printf functions.

Additionally the EXPORT and LOW ciphers were disabled since thay could
be used as part of the DROWN (CVE-2016-0800) and SLOTH (CVE-2015-7575)
attacks, but note that the oldstable (wheezye) and stable (jessie)
distributions are not affected by those attacks since the SSLv2 protocol
has already been dropped in the openssl package version 1.0.0c-2.

For the oldstable distribution (wheezy), these problems have been fixed
in version 1.0.1e-2+deb7u20.

For the stable distribution (jessie), these problems have been fixed in
version 1.0.1k-3+deb8u4.

For the unstable distribution (sid), these problems will be fixed shortly.

We recommend that you upgrade your openssl packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce AT lists.debian.org
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