Objavljena je revizija sigurnosne preporuke s oznakom DSA-2141-2, vezana uz programski paket NSS, a prvotno objavljene 6. siječnja 2011. Izvorna obavijest opisuje nepravilnosti vezane uz implementaciju TLS i SSLv3 protokola zbog kojih napadač može izvesti MITM napad. Uspješno izvođenje napada rezultira dodavanjem proizvoljnih podataka na početak korisničke sjednice. Revizija je objavljena zbog novih inačica koje podržavaju ponovno uspostavljenje sjednice s RFC5746 dodatkom te utjecaja na Network Security Services (NSS) programski paket kod kojeg određene varijable okruženja omogućuju nastavak rada klijenta s osjetljivim poslužiteljem. Nove inačice su dostupne na korištenje.
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Debian Security Advisory DSA-2141-2 Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.
http://www.debian.org/security/ Stefan Fritsch
January 06, 2011 http://www.debian.org/security/faq
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Package : nss
Vulnerability : SSL/TLS insecure renegotiation protocol design flaw
Problem type : remote
Debian-specific: no
CVE ID : CVE-2009-3555
CVE-2009-3555:
Marsh Ray, Steve Dispensa, and Martin Rex discovered a flaw in the TLS
and SSLv3 protocols. If an attacker could perform a man in the middle
attack at the start of a TLS connection, the attacker could inject
arbitrary content at the beginning of the user's session. This update
adds backported support for the new RFC5746 renegotiation extension
which fixes this issue.
The updated libraries allow to use shell environment variables to
configure if insecure renegotiation is still allowed. The syntax of
these environment variables is described in the release notes to
version 3.12.6 of nss:
https://developer.mozilla.org/NSS_3.12.6_release_notes
However, the default behaviour for nss in Debian 5.0 (Lenny) is
NSS_SSL_ENABLE_RENEGOTIATION=3, which allows clients to continue to
renegotiate with vulnerable servers.
For the stable distribution (lenny), this problem has been fixed
in version 3.12.3.1-0lenny3.
For the unstable distribution (sid), and the testing distribution
(squeeze), this problem has been fixed in version 3.12.6-1.
We recommend that you upgrade your nss package.
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/
Mailing list: Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.
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