Otkriveni su i ispravljeni višestruki propusti u radu programskog paketa Tor koji omogućuju udaljenim i/ili lokalnim napadačima pokretanje napada uskraćivanja usluga, izvršavanje proizvoljnog programskog koda i otkrivanje osjetljivih informacija.
Pri radu alata Tor otkriveni su višestruki problemi vezani uz preljev međuspremnika, pogreške u funkciji tor_realloc, neodgovarajuće upravljanje ulaznim podacima te neadekvatno upravljanje memorijom.
Posljedica:
Uočene ranjivosti napadači mogu iskoristiti za DoS napad, a eventualno za pokretanje proizvoljnog koda i/ili otkrivanje osjetljivih podataka.
Rješenje:
Kao rješenje problema savjetuje se primjena uobičajene nadogradnje sustava.
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Fedora Update Notification
FEDORA-2011-0650
2011-01-21 22:14:14
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Name : tor
Product : Fedora 13
Version : 0.2.1.29
Release : 1300.fc13
URL : http://tor.eff.org
Summary : Anonymizing overlay network for TCP (The onion router)
Description :
Tor is a connection-based low-latency anonymous communication system.
Applications connect to the local Tor proxy using the SOCKS protocol. The
local proxy chooses a path through a set of relays, in which each relay
knows its predecessor and successor, but no others. Traffic flowing down
the circuit is unwrapped by a symmetric key at each relay, which reveals
the downstream relay.
Warnings: Tor does no protocol cleaning. That means there is a danger
that application protocols and associated programs can be induced to
reveal information about the initiator. Tor depends on Privoxy and
similar protocol cleaners to solve this problem. This is alpha code,
and is even more likely than released code to have anonymity-spoiling
bugs. The present network is very small -- this further reduces the
strength of the anonymity provided. Tor is not presently suitable for
high-stakes anonymity.
--------------------------------------------------------------------------------
ChangeLog:
* Mon Jan 17 2011 Enrico Scholz <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.> -
0.2.1.29-1300
- updated to 0.2.1.29 (SECURITY)
- CVE-2011-0427: heap overflow bug, potential remote code execution
* Tue Dec 21 2010 Luke Macken <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.> - 0.2.1.28-1300
- updated to 0.2.1.28 (SECURITY: fixes a remotely exploitable heap overflow
bug)
* Fri Nov 26 2010 Enrico Scholz <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.> -
0.2.1.27-1300
- updated to 0.2.1.27
- work around broken chkconfig by adding dummy Default-Start: in -lsb
(#647512)
* Fri Nov 26 2010 Enrico Scholz <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.>
- fixed 'limit' statement in upstart script
* Tue Jun 1 2010 Enrico Scholz <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.> -
0.2.1.26-1300
- updated to 0.2.1.26
- removed workaround to install lsb initscript because parts of the
underlying problem have been fixed in redhat-lsb and the remaining
ones were solved by previous commit
* Tue Jun 1 2010 Enrico Scholz <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.> -
0.2.1.25-1301
- removed $local_fs dependency in -lsb initscript to workaround buggy
redhat-lsb; $remote_fs should imply it
* Thu Mar 18 2010 Enrico Scholz <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.> -
0.2.1.25-1300
- updated to 0.2.1.25
--------------------------------------------------------------------------------
References:
[ 1 ] Bug #671259 - CVE-2011-0015 CVE-2011-0016 CVE-2011-0427 CVE-2011-0490
CVE-2011-0491 CVE-2011-0492 CVE-2011-0493 tor: multiple security flaws fixed in
0.2.1.29
https://bugzilla.redhat.com/show_bug.cgi?id=671259
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This update can be installed with the "yum" update program. Use
su -c 'yum update tor' at the command line.
For more information, refer to "Managing Software with yum",
available at http://docs.fedoraproject.org/yum/.
All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
https://fedoraproject.org/keys
--------------------------------------------------------------------------------
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