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Gentoo Linux Security Advisory GLSA 201201-12 |
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http://security.gentoo.org/ |
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|
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Severity: Normal |
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Title: Tor: Multiple vulnerabilities |
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Date: January 23, 2012 |
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Bugs: #388769, #394969 |
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ID: 201201-12 |
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|
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Synopsis |
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======== |
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|
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Multiple vulnerabilities have been found in Tor, the most severe of |
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which may allow a remote attacker to execute arbitrary code. |
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|
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Background |
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========== |
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|
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Tor is an implementation of second generation Onion Routing, a |
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connection-oriented anonymizing communication service. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 net-misc/tor < 0.2.2.35 >= 0.2.2.35 |
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|
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Description |
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=========== |
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|
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Multiple vulnerabilities have been discovered in Tor: |
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|
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* When configured as client or bridge, Tor uses the same TLS |
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certificate chain for all outgoing connections (CVE-2011-2768). |
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* When configured as a bridge, Tor relays can distinguish incoming |
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bridge connections from client connections (CVE-2011-2769). |
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* An error in or/buffers.c could result in a heap-based buffer overflow |
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(CVE-2011-2778). |
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|
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Impact |
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====== |
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|
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A remote attacker could possibly execute arbitrary code or cause a |
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Denial of Service. Furthermore, a remote relay the user is directly |
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connected to may be able to disclose anonymous information about that |
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user or enumerate bridges in the user's connection. |
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|
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Workaround |
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========== |
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|
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There is no known workaround at this time. |
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|
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Resolution |
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========== |
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|
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All Tor users should upgrade to the latest version: |
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|
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=net-misc/tor-0.2.2.35" |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2011-2768 |
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http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-2768 |
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[ 2 ] CVE-2011-2769 |
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http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-2769 |
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[ 3 ] CVE-2011-2778 |
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http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-2778 |
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|
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Availability |
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============ |
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|
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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|
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http://security.gentoo.org/glsa/glsa-201201-12.xml |
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|
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Concerns? |
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========= |
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|
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users' machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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https://bugs.gentoo.org. |
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|
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License |
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======= |
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|
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Copyright 2012 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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|
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/2.5 |