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[ GLSA 200506-10 ] LutelWall: Insecure temporary file creation
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GLSA
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Joined: 12 May 2004
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PostPosted: Sat Jun 11, 2005 7:31 pm    Post subject: [ GLSA 200506-10 ] LutelWall: Insecure temporary file creati Reply with quote

Gentoo Linux Security Advisory

Title: LutelWall: Insecure temporary file creation (GLSA 200506-10)
Severity: normal
Exploitable: local
Date: June 11, 2005
Bug(s): #95378
ID: 200506-10

Synopsis

LutelWall is vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files.

Background

LutelWall is a high-level Linux firewall configuration tool.

Affected Packages

Package: net-firewall/lutelwall
Vulnerable: < 0.98
Unaffected: >= 0.98
Architectures: All supported architectures


Description

Eric Romang has discovered that the new_version_check() function in LutelWall insecurely creates a temporary file when updating to a new version.

Impact

A local attacker could create symbolic links in the temporary file directory, pointing to a valid file somewhere on the filesystem. When the update script is executed (usually by the root user), this would result in the file being overwritten with the rights of this user.

Workaround

There is no known workaround at this time.

Resolution

All LutelWall users should upgrade to the latest version:
Code:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-firewall/lutelwall-0.98"


References

CAN-2005-1879


Last edited by GLSA on Sun May 07, 2006 4:57 pm; edited 1 time in total
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