CVE-2010-2066

The mext_check_arguments function in fs/ext4/move_extent.c in the Linux kernel before 2.6.35 allows local users to overwrite an append-only file via a MOVE_EXT ioctl call that specifies this file as a donor.

From the Ubuntu Security Team

Dan Rosenberg discovered that the MOVE_EXT ext4 ioctl did not correctly check file permissions. A local attacker could overwrite append-only files, leading to potential data loss.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
linux	10.10 maverick	Not affected
	10.04 LTS lucid	Not affected
	9.10 karmic	Fixed 2.6.31-22.67
	9.04 jaunty	Not affected
	8.04 LTS hardy	Not affected
	6.06 LTS dapper	Not in release
linux-ec2	10.10 maverick	Ignored end of life
	10.04 LTS lucid	Fixed 2.6.32-309.18
	9.10 karmic	Fixed 2.6.31-307.21
	8.04 LTS hardy	Not in release
	6.06 LTS dapper	Not in release
linux-fsl-imx51	10.10 maverick	Not in release
	10.04 LTS lucid	Fixed 2.6.31-608.22
	9.10 karmic	Fixed 2.6.31-112.30
	8.04 LTS hardy	Not in release
	6.06 LTS dapper	Not in release
linux-lts-backport-maverick	10.10 maverick	Not in release
	10.04 LTS lucid	Fixed 2.6.35-25.44~lucid1
	9.10 karmic	Not in release
	8.04 LTS hardy	Not in release
	6.06 LTS dapper	Not in release
linux-source-2.6.15	10.10 maverick	Not in release
	10.04 LTS lucid	Not in release
	9.10 karmic	Not in release
	9.04 jaunty	Not in release
	8.04 LTS hardy	Not in release
	6.06 LTS dapper	Not affected

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
linux	Upstream: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=1f5a81e41f8b1a782c68d3843e9ec1bfaadf7d72 Karmic: http://chinstrap.ubuntu.com/~bradf/CVEs/CVE-2010-2066/patches/karmic/linux/0001-ext4-Make-sure-the-MOVE_EXT-ioctl-can-t-overwrite-appe.txt

Severity score breakdown

Parameter	Value
Base score	5.5 · Medium
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

References

Related Ubuntu Security Notices (USN)

USN-1074-1
Linux kernel vulnerabilities
25 February 2011

USN-1083-1
Linux kernel vulnerabilities
3 March 2011

USN-1000-1
Linux kernel vulnerabilities
19 October 2010

USN-1074-2
Linux kernel vulnerabilities
28 February 2011

Other references

https://www.cve.org/CVERecord?id=CVE-2010-2066