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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
Samba is prone to a unauthorized file access vulnerability.
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.
Samba version 3.6.0 and later.
Checks if a vulnerable version is present on the target host.
Update to version 4.12.15, 4.13.8, 4.14.4 or later.
Common Vulnerabilities and Exposures (CVE)
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