In the Linux kernel, the following vulnerability has been resolved:
ptrace: slightly saner 'get_dumpable()' logic
The 'dumpability' of a task is fundamentally about the memory image of
the task - the concept comes from whether it can core dump or not - and
makes no sense when you don't have an associated mm. And almost all users do in fact use it only for the case where the task
has a mm pointer. But we have one odd special case: ptrace_may_access() uses 'dumpable' to
check various other things entirely independently of the MM (typically
explicitly using flags like PTRACE_MODE_READ_FSCREDS).
Including for threads that no longer have a VM (and maybe never did, like most kernel threads). It's not what this flag was designed for, but it is what it is. The ptrace code does check that the uid/gid matches, so you do have to be uid-0 to see kernel thread details, but this means that the traditional "drop capabilities" model doesn't make any difference for this all.
Make it all make a *bit* more sense by saying that if you don't have a
MM pointer, we'll use a cached "last dumpability" flag if the thread
ever had a MM (it will be zero for kernel threads since it is never
set), and require a proper CAP_SYS_PTRACE capability to override.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 14
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
3.16.52
|
3.17
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
4.4.40
|
4.5
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
4.8.16
|
4.9
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
4.9.1
|
5.10.256
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
5.11
|
5.15.207
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
5.16
|
6.1.173
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
6.2
|
6.6.139
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
6.7
|
6.12.89
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
6.13
|
6.18.31
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
6.19
|
7.0.8
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
|
— | — |
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
|
— | — |
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*
|
— | — |
|
Debian Debian_Linux
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
|
— | — |
References 41
https://git.kernel.org/stable/c/01363cb3fbd0238ffdeb09f53e9039c9edf8a730
416baaa9-dc9f-4396-8d5f-8c081fb06d67
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416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/2a93a4fac7b6051d3be7cd1b015fe7320cd0404d
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/31e62c2ebbfdc3fe3dbdf5e02c92a9dc67087a3a
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/4709234fd1b95136ceb789f639b1e7ea5de1b181
416baaa9-dc9f-4396-8d5f-8c081fb06d67
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416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/8f907d345bae8f4b3f004c5abc56bf2dfb851ea7
416baaa9-dc9f-4396-8d5f-8c081fb06d67
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416baaa9-dc9f-4396-8d5f-8c081fb06d67
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af854a3a-2127-422b-91ae-364da2661108
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af854a3a-2127-422b-91ae-364da2661108
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af854a3a-2127-422b-91ae-364da2661108
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af854a3a-2127-422b-91ae-364da2661108
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af854a3a-2127-422b-91ae-364da2661108
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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134c704f-9b21-4f2e-91b3-4a467353bcc0
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0b0ca135-0b70-47e7-9f44-1890c2a1c46c