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TITLE:
Calibre "calibre-mount-helper" Weaknesses and Security Issues

SECUNIA ADVISORY ID:
SA46620

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/46620/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=46620

RELEASE DATE:
2011-11-03

DISCUSS ADVISORY:
http://secunia.com/advisories/46620/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
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 * Impact
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http://secunia.com/advisories/46620/

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https://ca.secunia.com/?page=viewadvisory&vuln_id=46620

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 and a security issues have been reported in Calibre,
which can be exploited by malicious, local users to manipulate
certain data and gain escalated privileges.

1) An error within the "calibre-mount-helper" utility can be
exploited to create arbitrary root-owned directories.

2) An error within the "calibre-mount-helper" utility can be
exploited to delete arbitrary empty directories.

3) An error within the "calibre-mount-helper" utility can be
exploited to create and delete the ".created_by_calibre_mount_helper"
file in arbitrary directories.

4) The "calibre-mount-helper" utility does not use the full path when
invoking other programs, which can be exploited to execute arbitrary
applications as root by changing the "PATH" environment variable.

5) The "calibre-mount-helper" utility can be used to mount, unmount,
and eject arbitrary directories and mountpoints.

6) Race conditions within the mount process can be exploited to e.g.
mount arbitrary directories via symlink attacks.

Note: Additionally, it's possible to inject arguments to the "mount"
utility.

SOLUTION:
Restrict access to trusted users only or remove the suid bit from the
"calibre-mount-helper" utility.

PROVIDED AND/OR DISCOVERED BY:
Jason A. Donenfeld. Additional information provided by Dan Rosenberg.

ORIGINAL ADVISORY:
https://bugs.launchpad.net/calibre/+bug/885027/

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
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