CVE-2011-3191

Published: 25 August 2011

Integer signedness error in the CIFSFindNext function in fs/cifs/cifssmb.c in the Linux kernel before 3.1 allows remote CIFS servers to cause a denial of service (memory corruption) or possibly have unspecified other impact via a large length value in a response to a read request for a directory.

From the Ubuntu Security Team

Darren Lavender discovered that the CIFS client incorrectly handled certain large values. A remote attacker with a malicious server could exploit this to crash the system or possibly execute arbitrary code as the root user.

Notes

Author	Note
apw	patch title is as below in CIFS tree, likely SHA1 added below: cifs: fix possible memory corruption in CIFSFindNext
kees	actual sha is below, old one from CIFS tree was c32dfffaf59f73bbcf4472141b851a4dc5db2bf0

Author

Note

apw

patch title is as below in CIFS tree, likely SHA1 added below:
cifs: fix possible memory corruption in CIFSFindNext

kees

actual sha is below, old one from CIFS tree was
c32dfffaf59f73bbcf4472141b851a4dc5db2bf0

Priority

Cvss 3 Severity Score

8.8

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	hardy	Released (2.6.24-29.94)
	lucid	Released (2.6.32-35.78)
	maverick	Released (2.6.35-30.60)
	natty	Released (2.6.38-12.51)
	oneiric	Not vulnerable (3.0.0-11.18)
	upstream	Released (3.1~rc7)
	Patches: Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Fixed by 9438fabb73eb48055b58b89fc51e0bc4db22fabd
linux-ec2 Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.32-319.39)
	maverick	Ignored (end of life)
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (3.1~rc7)
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 (3.1~rc7)
linux-lts-backport-maverick Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.35-30.60~lucid1)
	maverick	Does not exist
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (3.1~rc7)
linux-lts-backport-natty Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.38-12.51~lucid1)
	maverick	Does not exist
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (3.1~rc7)
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 (3.1~rc7)
linux-mvl-dove Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.32-219.37)
	maverick	Released (2.6.32-419.37)
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (3.1~rc7)
linux-ti-omap4 Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Does not exist
	maverick	Released (2.6.35-903.25)
	natty	Released (2.6.38-1209.16)
	oneiric	Not vulnerable (3.0.0-1205.10)
	upstream	Released (3.1~rc7)

Severity score breakdown

Parameter	Value
Base score	8.8
Attack vector	Adjacent
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Bugs

https://launchpad.net/bugs/834135

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