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Samba 3.6.0 < 4.12.15, 4.13.0 < 4.13.8, 4.14.0 < 4.14.4 File Access Vulnerability

Information

Severity

Severity

Medium

Family

Family

Denial of Service

CVSSv2 Base

CVSSv2 Base

6.6

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:H/Au:S/C:C/I:C/A:N

Solution Type

Solution Type

Vendor Patch

Created

Created

2 years ago

Modified

Modified

2 years ago

Summary

Samba is prone to a unauthorized file access vulnerability.

Insight

Insight

The Samba smbd file server must map Windows group identities (SIDs) into unix group ids (gids). The code that performs this had a flaw that could allow it to read data beyond the end of the array in the case where a negative cache entry had been added to the mapping cache. This could cause the calling code to return those values into the process token that stores the group membership for a user. Most commonly this flaw causes the calling code to crash, but it was found that an unprivileged user may be able to delete a file within a network share that they should have been disallowed access to.

Affected Software

Affected Software

Samba version 3.6.0 and later.

Detection Method

Detection Method

Checks if a vulnerable version is present on the target host.

Solution

Solution

Update to version 4.12.15, 4.13.8, 4.14.4 or later.

Common Vulnerabilities and Exposures (CVE)