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TITLE:
fail2ban Insecure Default Temporary Files Weakness

SECUNIA ADVISORY ID:
SA44253

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/44253/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=44253

RELEASE DATE:
2011-04-20

DISCUSS ADVISORY:
http://secunia.com/advisories/44253/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
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 * Criticality Level
 * Impact
 * Where
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 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/44253/

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https://ca.secunia.com/?page=viewadvisory&vuln_id=44253

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
Some weaknesses have been reported in fail2ban, which can be
exploited by malicious, local users to perform certain actions with
escalated privileges.

The weaknesses are caused due to the dshield, mail-buffered,
sendmail-buffered, and mynetwatchman actions using insecure temporary
files by default, which can be exploited to e.g. append data to
arbitrary files via symlink attacks.

The weaknesses are reported in version 0.8.4. Other versions may also
be affected.

SOLUTION:
Change the "tmpfile" option in the affected actions to a trusted
directory.

PROVIDED AND/OR DISCOVERED BY:
Reported by Tomasz Papszun in a Debian bug.

ORIGINAL ADVISORY:
Debian Bug #544232:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=544232

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
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