Secunia Security Advisory - Dan Rosenberg has reported two weaknesses in exim, which can be exploited by malicious, local users to perform certain actions with escalated privileges.
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TITLE:
exim Hardlink Handling and MBX Locking Two Weaknesses
SECUNIA ADVISORY ID:
SA40019
VERIFY ADVISORY:
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http://secunia.com/advisories/40019/
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RELEASE DATE:
2010-05-31
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http://secunia.com/advisories/40019/#comments
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http://secunia.com/advisories/40019/
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DESCRIPTION:
Dan Rosenberg has reported two weaknesses in exim, which can be
exploited by malicious, local users to perform certain actions with
escalated privileges.
1) An error when handling hardlinks within the mail directory during
the mail delivery process can be exploited to e.g. append information
to arbitrary files of another user.
Successful exploitation requires that the mail directory is
world-writable with the sticky bit set.
2) A race condition related to the MBX locking can be exploited to
e.g. change the permissions of another user's file via symlink
attacks.
Successful exploitation requires that MBX locking is used.
SOLUTION:
Fixed in the CVS repository and exim 4.72RC2.
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/
PROVIDED AND/OR DISCOVERED BY:
Dan Rosenberg
ORIGINAL ADVISORY:
http://lists.exim.org/lurker/message/20100524.175925.9a69f755.en.html
http://vcs.exim.org/viewvc/exim/exim-doc/doc-txt/ChangeLog?view=markup&pathrev=exim-4_72_RC2
1) http://bugs.exim.org/show_bug.cgi?id=988
2) http://bugs.exim.org/show_bug.cgi?id=989
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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