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Gentoo Linux Security Advisory GLSA 200510-11 |
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http://security.gentoo.org/ |
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|
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Severity: Low |
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Title: OpenSSL: SSL 2.0 protocol rollback |
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Date: October 12, 2005 |
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Bugs: #108852 |
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ID: 200510-11 |
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|
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Synopsis |
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======== |
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|
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When using a specific option, OpenSSL can be forced to fallback to the |
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less secure SSL 2.0 protocol. |
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|
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Background |
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========== |
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|
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OpenSSL is a toolkit implementing the Secure Sockets Layer, Transport |
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Layer Security protocols and a general-purpose cryptography library. |
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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 dev-libs/openssl < 0.9.8-r1 >= 0.9.8-r1 |
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*>= 0.9.7h |
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*>= 0.9.7g-r1 |
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*>= 0.9.7e-r2 |
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|
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Description |
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=========== |
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|
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Applications setting the SSL_OP_MSIE_SSLV2_RSA_PADDING option (or the |
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SSL_OP_ALL option, that implies it) can be forced by a third-party to |
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fallback to the less secure SSL 2.0 protocol, even if both parties |
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support the more secure SSL 3.0 or TLS 1.0 protocols. |
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|
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Impact |
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====== |
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|
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A man-in-the-middle attacker can weaken the encryption used to |
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communicate between two parties, potentially revealing sensitive |
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information. |
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|
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Workaround |
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========== |
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|
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If possible, disable the use of SSL 2.0 in all OpenSSL-enabled |
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applications. |
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|
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Resolution |
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========== |
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|
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All OpenSSL 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 dev-libs/openssl |
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|
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References |
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========== |
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|
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[ 1 ] CAN-2005-2969 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2969 |
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[ 2 ] OpenSSL security advisory |
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http://www.openssl.org/news/secadv_20051011.txt |
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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-200510-11.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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http://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 2005 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/2.0 |