Vulnerability Details : CVE-2013-1956
The create_user_ns function in kernel/user_namespace.c in the Linux kernel before 3.8.6 does not check whether a chroot directory exists that differs from the namespace root directory, which allows local users to bypass intended filesystem restrictions via a crafted clone system call.
Products affected by CVE-2013-1956
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:3.8.1:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:3.8.2:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:3.8.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:3.8.3:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:3.8.4:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2013-1956
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2013-1956
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
2.1
|
LOW | AV:L/AC:L/Au:N/C:N/I:P/A:N |
3.9
|
2.9
|
NIST |
CWE ids for CVE-2013-1956
-
Assigned by: nvd@nist.gov (Primary)
References for CVE-2013-1956
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http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3151527ee007b73a0ebd296010f1c0454a919c7d
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http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.8.6
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https://github.com/torvalds/linux/commit/3151527ee007b73a0ebd296010f1c0454a919c7d
userns: Don't allow creation if the user is chrooted · torvalds/linux@3151527 · GitHub
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http://www.openwall.com/lists/oss-security/2013/04/16/11
oss-security - Re: Re: Summary of security bugs (now fixed) in user namespaces
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