linux kernel 2.6.33.7 integer overflow in ext4_ext_get_blocks()

2010.08.24

Credit: Eugene Teo

Risk: Low

Local: Yes

Remote: No

CVE: CVE-2010-3015

CWE: CWE-189

CVSS Base Score: 4.7/10

Impact Subscore: 6.9/10

Exploitability Subscore: 3.4/10

Exploit range: Local

Attack complexity: Medium

Authentication: No required

Confidentiality impact: None

Integrity impact: None

Availability impact: Complete

This was reported by a customer. Integer overflow flaws were found in 
ext4_ext_in_cache() and ext4_ext_get_blocks(). We managed to triggered 
the case in ext4_ext_get_blocks() but did not attempt to try the other. 
This can trigger a BUG() on certain configuration of ext4 file systems.

Upstream commit:
http://git.kernel.org/linus/731eb1a03a8445cde2cb23ecfb3580c6fa7bb690

https://bugzilla.redhat.com/show_bug.cgi?id=624327

Thanks, Eugene

References:

http://marc.info/?l=oss-security&m=128197862004376&w=2

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=731eb1a03a8445cde2cb23ecfb3580c6fa7bb690

https://bugzilla.redhat.com/show_bug.cgi?id=624327

http://xforce.iss.net/xforce/xfdb/61156

http://www.securityfocus.com/bid/42477

http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.34

http://marc.info/?l=oss-security&m=128201627016896&w=2

http://marc.info/?l=oss-security&m=128192548904503&w=2

See this note in RAW Version

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linux kernel 2.6.33.7 integer overflow in ext4_ext_get_blocks()

References:

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