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Gentoo Linux Security Advisory GLSA 200410-29 |
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http://security.gentoo.org/ |
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|
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Severity: Normal |
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Title: PuTTY: Pre-authentication buffer overflow |
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Date: October 27, 2004 |
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Bugs: #69123 |
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ID: 200410-29 |
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|
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Synopsis |
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======== |
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|
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PuTTY contains a vulnerability allowing an SSH server to execute |
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arbitrary code on the connecting client. |
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|
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Background |
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========== |
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|
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PuTTY is a free implementation of Telnet and SSH for Win32 and Unix |
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platforms, along with an xterm terminal emulator. |
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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/putty <= 0.55 >= 0.56 |
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|
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Description |
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=========== |
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|
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PuTTY fails to do proper bounds checking on SSH2_MSG_DEBUG packets. The |
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"stringlen" parameter value is incorrectly checked due to signedness |
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issues. Note that this vulnerability is similar to the one described in |
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GLSA 200408-04 but not the same. |
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|
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Impact |
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====== |
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|
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When PuTTY connects to a server using the SSH2 protocol, an attacker |
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may be able to send specially crafted packets to the client, resulting |
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in the execution of arbitrary code with the permissions of the user |
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running PuTTY. Note that this is possible during the authentication |
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process but before host key verification. |
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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 PuTTY 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/putty-0.56" |
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|
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References |
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========== |
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|
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[ 1 ] iDEFENSE Security Advisory 10.27.04 |
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http://www.idefense.com/application/poi/display?id=155 |
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[ 2 ] PuTTY ChangeLog |
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http://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html |
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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-200410-29.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 2004 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/1.0 |