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CVE-2011-1833

Publication date 9 August 2011

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Race condition in the ecryptfs_mount function in fs/ecryptfs/main.c in the eCryptfs subsystem in the Linux kernel before 3.1 allows local users to bypass intended file permissions via a mount.ecryptfs_private mount with a mismatched uid.

From the Ubuntu Security Team

Vasiliy Kulikov and Dan Rosenberg discovered that ecryptfs did not correctly check the origin of mount points. A local attacker could exploit this to trick the system into unmounting arbitrary mount points, leading to a denial of service.

Read the notes from the security team

Status

Package Ubuntu Release Status
ecryptfs-utils 11.10 oneiric
Fixed 89-0ubuntu2
11.04 natty
Fixed 87-0ubuntu1.1
10.10 maverick
Fixed 83-0ubuntu3.2.10.10.1
10.04 LTS lucid
Fixed 83-0ubuntu3.2.10.04.1
8.04 LTS hardy
Not affected
linux 11.10 oneiric
Not affected
11.04 natty
Fixed 2.6.38-11.49
10.10 maverick
Fixed 2.6.35-30.60
10.04 LTS lucid
Fixed 2.6.32-35.78
8.04 LTS hardy
Not affected
linux-ec2 11.10 oneiric Not in release
11.04 natty Not in release
10.10 maverick Ignored
10.04 LTS lucid
Fixed 2.6.32-319.39
8.04 LTS hardy Not in release
linux-fsl-imx51 11.10 oneiric Not in release
11.04 natty Not in release
10.10 maverick Not in release
10.04 LTS lucid
Fixed 2.6.31-610.27
8.04 LTS hardy Not in release
linux-lts-backport-maverick 11.10 oneiric Not in release
11.04 natty Not in release
10.10 maverick Not in release
10.04 LTS lucid
Fixed 2.6.35-30.60~lucid1
8.04 LTS hardy Not in release
linux-lts-backport-natty 11.10 oneiric Not in release
11.04 natty Not in release
10.10 maverick Not in release
10.04 LTS lucid
Fixed 2.6.38-11.49~lucid1
8.04 LTS hardy Not in release
linux-lts-backport-oneiric 11.10 oneiric Not in release
11.04 natty Not in release
10.10 maverick Not in release
10.04 LTS lucid
Not affected
8.04 LTS hardy Not in release
linux-mvl-dove 11.10 oneiric Not in release
11.04 natty Not in release
10.10 maverick
Fixed 2.6.32-419.37
10.04 LTS lucid
Fixed 2.6.32-219.37
8.04 LTS hardy Not in release
linux-ti-omap4 11.10 oneiric
Not affected
11.04 natty
Fixed 2.6.38-1209.15
10.10 maverick
Fixed 2.6.35-903.23
10.04 LTS lucid Not in release
8.04 LTS hardy Not in release

Notes

mdeslaur

There are two parts to this fix, 1- kernel fix, 2- userspace fix

Patch details

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

Package Patch details
linux

References

Related Ubuntu Security Notices (USN)

    • USN-1219-1
    • Linux kernel (Maverick backport) vulnerabilities
    • 29 September 2011
    • USN-1253-1
    • Linux kernel vulnerabilities
    • 8 November 2011
    • USN-1211-1
    • Linux kernel vulnerabilities
    • 21 September 2011
    • USN-1202-1
    • Linux kernel (OMAP4) vulnerabilities
    • 13 September 2011
    • USN-1239-1
    • Linux kernel (EC2) vulnerabilities
    • 25 October 2011
    • USN-1188-1
    • eCryptfs vulnerabilities
    • 9 August 2011
    • USN-1227-1
    • Linux kernel vulnerabilities
    • 11 October 2011
    • USN-1240-1
    • Linux kernel (Marvell DOVE) vulnerabilities
    • 25 October 2011
    • USN-1204-1
    • Linux kernel (i.MX51) vulnerabilities
    • 13 September 2011
    • USN-1256-1
    • Linux kernel (Natty backport) vulnerabilities
    • 9 November 2011
    • USN-1245-1
    • Linux kernel (Marvell DOVE) vulnerabilities
    • 25 October 2011
    • USN-1212-1
    • Linux kernel (OMAP4) vulnerabilities
    • 21 September 2011

Other references