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Gentoo Linux Security Advisory GLSA 200509-21 |
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http://security.gentoo.org/ |
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Severity: Normal |
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Title: Hylafax: Insecure temporary file creation in xferfaxstats |
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script |
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Date: September 30, 2005 |
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Bugs: #106882 |
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ID: 200509-21 |
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Synopsis |
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======== |
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|
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Hylafax is vulnerable to linking attacks, potentially allowing a local |
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user to overwrite arbitrary files. |
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Background |
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========== |
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|
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Hylafax is a client-server fax package for class 1 and 2 fax modems. |
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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/hylafax < 4.2.2 *>= 4.2.0-r3 |
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*>= 4.2.1-r2 |
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>= 4.2.2 |
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Description |
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=========== |
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|
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Javier Fernandez-Sanguino has discovered that xferfaxstats cron script |
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supplied by Hylafax insecurely creates temporary files with predictable |
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filenames. |
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|
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Impact |
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====== |
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|
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A local attacker could create symbolic links in the temporary file |
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directory, pointing to a valid file somewhere on the filesystem. When |
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the xferfaxstats script of Hylafax is executed, this would result in |
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the file being overwritten with the rights of the user running the |
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script, which typically is the root user. |
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|
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Workaround |
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========== |
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There is no known workaround at this time. |
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Resolution |
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========== |
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All Hylafax users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose net-misc/hylafax |
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|
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References |
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========== |
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[ 1 ] Original bug report |
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http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=329384 |
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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-200509-21.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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|
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License |
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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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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/2.0 |
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