Description
The DNS resolution functionality in the CIFS implementation in the Linux kernel before 2.6.35, when CONFIG_CIFS_DFS_UPCALL is enabled, relies on a user's keyring for the dns_resolver upcall in the cifs.upcall userspace helper, which allows local users to spoof the results of DNS queries and perform arbitrary CIFS mounts via vectors involving an add_key call, related to a "cache stuffing" issue and MS-DFS referrals.
CVSS breakdown
CVSS 3.1
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected products
- Canonical / Ubuntu Linux9.10 – 9.10
- Canonical / Ubuntu Linux10.10 – 10.10
- Canonical / Ubuntu Linux10.04 – 10.04
- Canonical / Ubuntu Linux6.06 – 6.06
- Canonical / Ubuntu Linux8.04 – 8.04
- Canonical / Ubuntu Linux9.04 – 9.04
- Linux / Linux kernel2.6.35
- SUSE / suse_linux_enterprise_desktop11 – 11
- SUSE / SUSE Linux Enterprise Server11 – 11
- VMware / esx4.1 – 4.1
- VMware / esx4.0 – 4.0
References
- MISChttp://www.redhat.com/support/errata/RHSA-2010-0610.html
- VENDOR_ADVISORYhttp://www.ubuntu.com/usn/USN-1000-1
- MAILING_LISThttp://marc.info/?l=oss-security&m=128078387328921&w=2
- MAILING_LISThttp://lists.opensuse.org/opensuse-security-announce/2010-09/msg00004.html
- MISChttp://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.35
- VENDOR_ADVISORYhttp://secunia.com/advisories/43315
- MAILING_LISThttp://marc.info/?l=oss-security&m=128072090331700&w=2
- VENDOR_ADVISORYhttp://www.vmware.com/security/advisories/VMSA-2011-0003.html
- MISChttps://bugzilla.redhat.com/show_bug.cgi?id=612166
- MISChttp://www.securityfocus.com/archive/1/516397/100/0/threaded
- MISChttp://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=4c0c03ca54f72fdd5912516ad0a23ec5cf01bda7
- VENDOR_ADVISORYhttp://www.mandriva.com/security/advisories?name=MDVSA-2010:172
- MAILING_LISThttp://marc.info/?l=oss-security&m=128080755321157&w=2