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Gentoo Linux Security Advisory GLSA 200804-16 |
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http://security.gentoo.org/ |
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Severity: High |
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Title: rsync: Execution of arbitrary code |
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Date: April 17, 2008 |
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Bugs: #216887 |
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ID: 200804-16 |
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Synopsis |
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======== |
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|
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A buffer overflow in rsync might lead to the remote execution of |
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arbitrary code when extended attributes are being used. |
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Background |
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========== |
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|
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rsync is a file transfer program to keep remote directories |
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synchronized. |
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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/rsync < 2.6.9-r6 >= 2.6.9-r6 |
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Description |
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=========== |
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|
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Sebastian Krahmer of SUSE reported an integer overflow in the |
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expand_item_list() function in the file util.c which might lead to a |
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heap-based buffer overflow when extended attribute (xattr) support is |
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enabled. |
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Impact |
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====== |
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|
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A remote attacker could send a file containing specially crafted |
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extended attributes to an rsync deamon, or entice a user to sync from |
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an rsync server containing specially crafted files, possibly leading to |
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the execution of arbitrary code. |
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|
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Please note that extended attributes are only enabled when USE="acl" is |
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enabled, which is the default setting. |
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Workaround |
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========== |
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|
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Disable extended attributes in the rsync daemon by setting "refuse |
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options = xattrs" in the file "/etc/rsyncd.conf" (or append "xattrs" to |
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an existing "refuse" statement). When synchronizing to a server, do not |
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provide the "-X" parameter to rsync. You can also disable the "acl" USE |
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flag for rsync and recompile the package. |
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Resolution |
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========== |
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All rsync users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=net-misc/rsync-2.6.9-r6" |
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References |
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========== |
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[ 1 ] CVE-2008-1720 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1720 |
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Availability |
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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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http://security.gentoo.org/glsa/glsa-200804-16.xml |
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Concerns? |
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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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License |
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======= |
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Copyright 2008 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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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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http://creativecommons.org/licenses/by-sa/2.5 |
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