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Tor Multiple Weaknesses and Vulnerability
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Secunia Advisory:
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SA26140
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Release Date:
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2007-07-24
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Last Update:
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2007-07-31
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Popularity:
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6,415 views
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Critical:
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Less critical
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Impact:
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Security Bypass
Exposure of sensitive information
DoS
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Tor 0.1.0.x
Tor 0.1.1.x
Tor 0.1.2.x
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Subscribe:
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| CVE reference: | CVE-2007-4096
CVE-2007-4097
CVE-2007-4098
CVE-2007-4099
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Description:
Some weaknesses and a vulnerability have been reported in Tor, which potentially can be exploited by malicious people to bypass certain security restrictions, disclose certain sensitive information, or potentially cause a DoS (Denial of Service).
1) An error in the handling of streamid's from different exits within a circuit can be exploited e.g. by a malicious Tor server within the circuit to inject arbitrary data into the TCP stream.
2) Sending destroy cells from a circuit's origin includes sending out a reason for tearing down the circuit. This weakens the Tor anonymity concept and may allow an attacker to narrow down users from a larger list.
3) An error in the handling of guard nodes can be exploited to aid in anonymity-related attacks.
4) A boundary error within the BSD natd support can be exploited to e.g. crash the application.
Successful exploitation requires that the Natdport configuration option is added to the torrc file on a BSD system.
The weaknesses and vulnerability are reported in versions prior to 0.1.2.15.
Solution:
Update to version 0.1.2.15.
http://tor.eff.org/download.html.en
Provided and/or discovered by:
1-2) The vendor credits lodger.
3) Reported by the vendor.
4) The vendor credits croup.
Changelog:
2007-07-31: Added CVE reference.
Original Advisory:
http://archives.seul.org/or/announce/Jul-2007/msg00000.html
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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