medium
5
CWE
119
Advisory Published
CVE Published
Updated

CVE-2011-0719: Buffer Overflow

First published: Thu Feb 17 2011(Updated: )

A flaw was found in the way Samba handles the file descriptor sets (fd_set) datastructure. The Samba codebase uses file descriptor sets in various places. The fd_set structure is a fixed size defined by the FD_SETSIZE variable. If a file descriptor with a value greater than or equal to FD_SETSIZE is added to a set, it can set a single bit on the stack to a '1'. In Red Hat Enterprise Linux, all samba processes except for smbd have a limit set which prevents a process from allocating more than 1024 file descriptors by default. 1024 is the value of FD_SETSIZE on Red Hat Enterprise Linux. smbd does not cap the maximum allowed file descriptors below 1024. This means that if a remote attacker has the ability to open files on a Samba server, they may be able to flip arbitrary stack bits to a '1'. It is not currently believed that this flaw can be used for arbitrary code execution, but the possibility should not be ruled out. Acknowledgements: Red Hat would like to thank the Samba team for reporting this issue. Upstream acknowledges Volker Lendecke of SerNet as the original reporter.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
Samba=3.0.0
Samba=3.0.1
Samba=3.0.2
Samba=3.0.2-a
Samba=3.0.2a
Samba=3.0.3
Samba=3.0.4
Samba=3.0.4-rc1
Samba=3.0.5
Samba=3.0.6
Samba=3.0.7
Samba=3.0.8
Samba=3.0.9
Samba=3.0.10
Samba=3.0.11
Samba=3.0.12
Samba=3.0.13
Samba=3.0.14
Samba=3.0.14-a
Samba=3.0.14a
Samba=3.0.15
Samba=3.0.16
Samba=3.0.17
Samba=3.0.18
Samba=3.0.19
Samba=3.0.20
Samba=3.0.20-a
Samba=3.0.20-b
Samba=3.0.20a
Samba=3.0.20b
Samba=3.0.21
Samba=3.0.21-a
Samba=3.0.21-b
Samba=3.0.21-c
Samba=3.0.21a
Samba=3.0.21b
Samba=3.0.21c
Samba=3.0.22
Samba=3.0.23
Samba=3.0.23-a
Samba=3.0.23-b
Samba=3.0.23-c
Samba=3.0.23-d
Samba=3.0.23a
Samba=3.0.23b
Samba=3.0.23c
Samba=3.0.23d
Samba=3.0.24
Samba=3.0.25
Samba=3.0.25-a
Samba=3.0.25-b
Samba=3.0.25-c
Samba=3.0.25-pre1
Samba=3.0.25-pre2
Samba=3.0.25-rc1
Samba=3.0.25-rc2
Samba=3.0.25-rc3
Samba=3.0.25a
Samba=3.0.25b
Samba=3.0.25c
Samba=3.0.26
Samba=3.0.26-a
Samba=3.0.26a
Samba=3.0.27
Samba=3.0.27-a
Samba=3.0.28
Samba=3.0.28-a
Samba=3.0.29
Samba=3.0.30
Samba=3.0.31
Samba=3.0.32
Samba=3.0.33
Samba=3.0.34
Samba=3.0.35
Samba=3.0.36
Samba=3.0.37
Samba=3.1.0
Samba=3.2.0
Samba=3.2.1
Samba=3.2.2
Samba=3.2.3
Samba=3.2.4
Samba=3.2.5
Samba=3.2.6
Samba=3.2.7
Samba=3.2.8
Samba=3.2.9
Samba=3.2.10
Samba=3.2.11
Samba=3.2.12
Samba=3.2.13
Samba=3.2.14
Samba=3.2.15
Samba=3.3.0
Samba=3.3.1
Samba=3.3.2
Samba=3.3.3
Samba=3.3.4
Samba=3.3.5
Samba=3.3.6
Samba=3.3.7
Samba=3.3.8
Samba=3.3.9
Samba=3.3.10
Samba=3.3.11
Samba=3.3.12
Samba=3.3.13
Samba=3.3.14
Samba=3.4.0
Samba=3.4.1
Samba=3.4.2
Samba=3.4.3
Samba=3.4.4
Samba=3.4.5
Samba=3.4.6
Samba=3.4.7
Samba=3.4.8
Samba=3.4.9
Samba=3.4.10
Samba=3.4.11
Samba=3.5.0
Samba=3.5.1
Samba=3.5.2
Samba=3.5.3
Samba=3.5.4
Samba=3.5.5
Samba=3.5.6

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=678328

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