This bug was fixed in the package openssl - 1.0.1-4ubuntu5.35
---------------
openssl (1.0.1-4ubuntu5.35) precise-security; urgency=medium
* SECURITY UPDATE: side channel attack on modular exponentiation
- debian/patches/CVE-2016-0702.patch: use constant-time calculations in
crypto/bn/asm/x86_64-mont5.pl, crypto/bn/bn_exp.c,
crypto/perlasm/x86_64-xlate.pl, crypto/constant_time_locl.h.
- CVE-2016-0702
* SECURITY UPDATE: double-free in DSA code
- debian/patches/CVE-2016-0705.patch: fix double-free in
crypto/dsa/dsa_ameth.c.
- CVE-2016-0705
* SECURITY UPDATE: BN_hex2bn/BN_dec2bn NULL pointer deref/heap corruption
- debian/patches/CVE-2016-0797.patch: prevent overflow in
crypto/bn/bn_print.c, crypto/bn/bn.h.
- CVE-2016-0797
* SECURITY UPDATE: memory leak in SRP database lookups
- debian/patches/CVE-2016-0798.patch: disable SRP fake user seed and
introduce new SRP_VBASE_get1_by_user function that handled seed
properly in apps/s_server.c, crypto/srp/srp.h, crypto/srp/srp_vfy.c,
util/libeay.num, openssl.ld.
- CVE-2016-0798
* SECURITY UPDATE: memory issues in BIO_*printf functions
- debian/patches/CVE-2016-0799.patch: prevent overflow in
crypto/bio/b_print.c.
- CVE-2016-0799
* debian/patches/preserve_digests_for_sni.patch: preserve negotiated
digests for SNI when SSL_set_SSL_CTX is called in ssl/ssl_lib.c.
(LP: #1550643)
-- Marc Deslauriers <marc.deslauri...@ubuntu.com> Mon, 29 Feb 2016
08:01:48 -0500
** Changed in: openssl (Ubuntu Precise)
Status: Confirmed => Fix Released
** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-0702
** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-0705
** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-0797
** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-0798
** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-0799
** Changed in: openssl (Ubuntu Trusty)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1550643
Title:
Please backport OpenSSL SNI signature algorithms fix.
Status in openssl package in Ubuntu:
Fix Released
Status in openssl source package in Precise:
Fix Released
Status in openssl source package in Trusty:
Fix Released
Bug description:
If an OpenSSL consumer uses SSL_set_SSL_CTX (very commonly done with
SNI), OpenSSL 1.0.1i and earlier lose internal state relating to TLS
1.2 which causes it to forget the peer's digest preferences. The end
result is such servers will *only* sign SHA-1 ServerKeyExchanges in
TLS 1.2, even if the peer advertises other hashes or even doesn't
advertise SHA-1 at all.
See:
https://rt.openssl.org/Ticket/Display.html?id=3560
https://bugzilla.redhat.com/show_bug.cgi?id=1150033
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=4e05aedbcab7f7f83a887e952ebdcc5d4f2291e4
http://www.ietf.org/mail-archive/web/tls/current/msg19195.html
Glancing at packages.ubuntu.com, this seems to affect Ubuntu vivid and
below. It would be greatly appreciated if you would backport this fix
to all applicable releases so Ubuntu servers do not become the
limiting factor in someday removing SHA-1 here.
The links above should have reproduction steps you can use to confirm
the bug and test the fix. (Note that it requires a build of OpenSSL
1.0.2 to confirm the bug. OpenSSL 1.0.1's s_client doesn't print the
necessary information.)
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