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hiveproHive ProHIVEPRO:0FD85E9ED6B2DCA44395302577E41C7B
HistoryMar 08, 2022 - 4:41 p.m.

Dirty Pipe: A privilege escalation vulnerability in Linux Kernel

2022-03-0816:41:45
Hive Pro
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1374

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.2 High

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

0.076 Low

EPSS

Percentile

94.2%

THREAT LEVEL: Red. For a detailed advisory, download the pdf file here A vulnerability in the Linux kernel existed since version 5.8 and allows overwriting data in arbitrary read-only files. Because unprivileged processes can inject code into root processes, this results in privilege escalation. It has been named Dirty Pipe by the researcher. It is a local privilege escalation vulnerability assigned CVE-2022-0847. This bug is due to a lack of proper initialization in the Linux kernel's 'copy_page_to_iter_pipe' and 'push_pipe' functions. An attacker could use this issue to write to pages in the page cache that are backed up by read-only files, escalating their privileges on the system. Attackers with read permissions could use the following steps to exploit this bug: 1. Create a pipe. 2. Fill the pipe with arbitrary data 3. Drain the pipe 4. Splice data from the target file into the pipe from just before the target offset. 5. Write arbitrary data into the pipe A public POC of this issue is available. So, organizations should upgrade to Linux kernel version 5.16.11, 5.15.25 and 5.10.102 to eliminate the risk. Potential MITRE ATT&CK TTPs are: TA0004: Privilege Escalation T1068: Exploitation for Privilege Escalation Vulnerability Detail Patch Link https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/snapshot/linux-9d2231c5d74e13b2a0546fee6737ee4446017903.tar.gz References https://dirtypipe.cm4all.com/

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.2 High

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

0.076 Low

EPSS

Percentile

94.2%