CVE-2011-3363

Published: 3 October 2011

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.

Notes

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

Priority

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	hardy	Not vulnerable
	lucid	Released (2.6.32-33.64)
	maverick	Released (2.6.35-30.61)
	natty	Released (2.6.38-10.44)
	oneiric	Not vulnerable (2.6.39-0.4)
	upstream	Released (2.6.39)
	Patches: Introduced by e4cce94c9c8797b08faf6a79396df4d175e377fa Fixed by 70945643722ffeac779d2529a348f99567fa5c33 Introduced by e4cce94c9c8797b08faf6a79396df4d175e377fa Fixed by 221d1d797202984cb874e3ed9f1388593d34ee22
linux-ec2 Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.32-317.32)
	maverick	Ignored (end of life)
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (2.6.39)
linux-fsl-imx51 Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.31-611.29)
	maverick	Does not exist
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (2.6.39)
linux-lts-backport-maverick Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.35-30.61~lucid1)
	maverick	Does not exist
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (2.6.39)
linux-lts-backport-natty Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.38-10.44~lucid1)
	maverick	Does not exist
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (2.6.39)
linux-lts-backport-oneiric Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Not vulnerable
	maverick	Does not exist
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (2.6.39)
linux-mvl-dove Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.32-217.34)
	maverick	Released (2.6.32-417.34)
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (2.6.39)
linux-ti-omap4 Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Does not exist
	maverick	Released (2.6.35-903.26)
	natty	Released (2.6.38-1209.17)
	oneiric	Not vulnerable (2.6.38-1309.13)
	upstream	Released (2.6.39)

Severity score breakdown

Parameter	Value
Base score	6.5
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

Bugs

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