CVE-2011-3363

Publication date 3 October 2011

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.5 · Medium

Score breakdown

The setup_cifs_sb function in fs/cifs/connect.c in the Linux kernel before 2.6.39 does not properly handle DFS referrals, which allows remote CIFS servers to cause a denial of service (system crash) by placing a referral at the root of a share.

From the Ubuntu Security Team

Yogesh Sharma discovered that CIFS did not correctly handle UNCs that had no prefixpaths. A local attacker with access to a CIFS partition could exploit this to crash the system, leading to a denial of service.

Read the notes from the security team

Status

Package Ubuntu Release Status
linux 11.10 oneiric
Not affected
11.04 natty
Fixed 2.6.38-10.44
10.10 maverick
Fixed 2.6.35-30.61
10.04 LTS lucid
Fixed 2.6.32-33.64
8.04 LTS hardy
Not affected
linux-ec2 11.10 oneiric Not in release
11.04 natty Not in release
10.10 maverick Ignored end of life
10.04 LTS lucid
Fixed 2.6.32-317.32
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 2.6.31-611.29
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 2.6.35-30.61~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 2.6.38-10.44~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 2.6.32-417.34
10.04 LTS lucid
Fixed 2.6.32-217.34
8.04 LTS hardy Not in release
linux-ti-omap4 11.10 oneiric
Not affected
11.04 natty
Fixed 2.6.38-1209.17
10.10 maverick
Fixed 2.6.35-903.26
10.04 LTS lucid Not in release
8.04 LTS hardy Not in release

Notes

mdeslaur

from oss-security: "If you have this, you might also want cifs: add fallback in is_path_accessible for old servers 221d1d797202984cb874e3ed9f1388593d34ee22"

Patch details

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

Package Patch details
linux

Severity score breakdown

Parameter Value
Base score 6.5 · Medium
Attack vector Adjacent
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-1241-1
    • Linux kernel (i.MX51) vulnerabilities
    • 25 October 2011
    • USN-1243-1
    • Linux kernel vulnerabilities
    • 25 October 2011
    • USN-1281-1
    • Linux (OMAP4) vulnerabilities
    • 24 November 2011
    • USN-1244-1
    • Linux kernel (OMAP4) vulnerabilities
    • 25 October 2011
    • USN-1168-1
    • Linux kernel vulnerabilities
    • 15 July 2011
    • USN-1162-1
    • Linux kernel vulnerabilities (Marvell Dove)
    • 29 June 2011
    • USN-1167-1
    • Linux kernel vulnerabilities
    • 13 July 2011
    • USN-1256-1
    • Linux kernel (Natty backport) vulnerabilities
    • 9 November 2011
    • USN-1242-1
    • Linux kernel (Maverick backport) vulnerabilities
    • 25 October 2011
    • USN-1161-1
    • Linux kernel vulnerabilities (EC2)
    • 13 July 2011
    • USN-1159-1
    • Linux kernel vulnerabilities (Marvell Dove)
    • 13 July 2011

Other references