-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512
Debian Security Advisory DSA-2993-1 email@example.com http://www.debian.org/security/ Peter Palfrader July 31, 2014 http://www.debian.org/security/faq
Package : tor CVE ID : CVE-2014-5117
Several issues have been discovered in Tor, a connection-based low-latency anonymous communication system, resulting in information leaks.
o Relay-early cells could be used by colluding relays on the network to tag user circuits and so deploy traffic confirmation attacks [CVE-2014-5117]. The updated version emits a warning and drops the circuit upon receiving inbound relay-early cells, preventing this specific kind of attack. Please consult the following advisory for more details about this issue:
o A bug in the bounds-checking in the 32-bit curve25519-donna implementation could cause incorrect results on 32-bit implementations when certain malformed inputs were used along with a small class of private ntor keys. This flaw does not currently appear to allow an attacker to learn private keys or impersonate a Tor server, but it could provide a means to distinguish 32-bit Tor implementations from 64-bit Tor implementations.
The following additional security-related improvements have been implemented:
o As a client, the new version will effectively stop using CREATE_FAST cells. While this adds computational load on the network, this approach can improve security on connections where Tor's circuit handshake is stronger than the available TLS connection security levels.
o Prepare clients to use fewer entry guards by honoring the consensus parameters. The following article provides some background:
For the stable distribution (wheezy), these problems have been fixed in version 0.2.4.23-1~deb7u1.
For the testing distribution (jessie) and the unstable distribution (sid), these problems have been fixed in version 0.2.4.23-1.
For the experimental distribution, these problems have been fixed in version 0.2.5.6-alpha-1.
We recommend that you upgrade your tor packages.
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: firstname.lastname@example.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1
iQIcBAEBCgAGBQJT2ht+AAoJEAVMuPMTQ89EtFgP/3AWMfTTOxdZn046F/QemXPl zuDTBhfllKc2s0UXOV63/yjfqr0oa703a/EhWIwZttc9NTi03NY9iKEwNeB+HUCN b3hENNISFdVp5i11pmbExSTGhfmgBLMPXXJAKbj5Zz1wsUr4SKJpsI0caaBXOOYp mTOHy0iKvT8RnpBiR0v2pXcCAQEqPy/7j99npO8SDwlOIcG7bmePc+L6YsHT99gh shNxnnjQIqO45rVHkqVCJc7uEx5k3i3rq0nDQnTrbiZI4G2zOJi7XfteJlCzl0vc XUt/7cTQeKyIRnNhRE09BctSs+bygCOJXY94iBoOc3eTxGeMoLcORRGZ8R1Jae99 cj8cfT3rH/SP1uWON071I9awwhXaC0nwHtkejAiA6S51rZBaUnQqCFEHp/D3ku7V NZ8Iux1JYkuXFYyU/FgFouRpbyt3ApITgKFjCySZmH0Kcm7C78gUuHyXhgvQfhdw MG9DvNIMlRKNAOXlBA9ZUSNpz1YzHRrv0KpwPnlaKSMwvuuuzhfXqFUzbEFLjbkL pPx0goe/BAmdRDKD0to4JhnpzRh71HtZwIOwJWQpqQ/p2IN0s7C5hrfk+g+Bh5kl fQBUnE18ZJC9ytQlUkYUd0Isc6HfmSQn3C2KA8pDV5jXn4tCMe9u2kfsB10uAPiY K/PnpW3fw41iiJPdYDZI =+/Vb -----END PGP SIGNATURE-----