Vulnerability Name:

CVE-2018-7273 (CCN-139312)

Assigned:2018-02-20
Published:2018-02-20
Updated:2019-03-01
Summary:In the Linux kernel through 4.15.4, the floppy driver reveals the addresses of kernel functions and global variables using printk calls within the function show_floppy in drivers/block/floppy.c. An attacker can read this information from dmesg and use the addresses to find the locations of kernel code and data and bypass kernel security protections such as KASLR.
CVSS v3 Severity:5.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)
5.0 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): None
Availibility (A): None
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
6.7 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:4.9 Medium (CVSS v2 Vector: AV:L/AC:L/Au:N/C:C/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): None
Availibility (A): None
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-200
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2018-7273

Source: BID
Type: Third Party Advisory, VDB Entry
103088

Source: CCN
Type: BID-103088
Linux Kernel 'drivers/block/floppy.c' Local Security Bypass Vulnerability

Source: XF
Type: UNKNOWN
linux-kernel-cve20187273-sec-bypass(139312)

Source: CCN
Type: LKML Web site
floppy: Don't print kernel addresses to log in show_floppy

Source: MISC
Type: Mailing List, Third Party Advisory
https://lkml.org/lkml/2018/2/20/669

Source: CCN
Type: Packet Storm Security [03-22-2018]
Linux Kernel show_floppy KASLR Address Leak

Source: EXPLOIT-DB
Type: EXPLOIT
Offensive Security Exploit Database [03-22-2018]

Source: EXPLOIT-DB
Type: Exploit, Third Party Advisory, VDB Entry
44325

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2018-7273

Vulnerable Configuration:Configuration 1:
  • cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version <= 4.15.4)

    • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:4.15.4:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.xenial:def:201872730000000
    V
    		CVE-2018-7273 on Ubuntu 16.04 LTS (xenial) - negligible.
    2018-02-21
    oval:com.ubuntu.disco:def:201872730000000
    V
    		CVE-2018-7273 on Ubuntu 19.04 (disco) - negligible.
    2018-02-21
    oval:com.ubuntu.bionic:def:201872730000000
    V
    		CVE-2018-7273 on Ubuntu 18.04 LTS (bionic) - negligible.
    2018-02-21
    oval:com.ubuntu.artful:def:20187273000
    V
    		CVE-2018-7273 on Ubuntu 17.10 (artful) - negligible.
    2018-02-20
    oval:com.ubuntu.xenial:def:20187273000
    V
    		CVE-2018-7273 on Ubuntu 16.04 LTS (xenial) - negligible.
    2018-02-20
    oval:com.ubuntu.bionic:def:20187273000
    V
    		CVE-2018-7273 on Ubuntu 18.04 LTS (bionic) - negligible.
    2018-02-20
    oval:com.ubuntu.cosmic:def:201872730000000
    V
    		CVE-2018-7273 on Ubuntu 18.10 (cosmic) - negligible.
    2018-02-20
    oval:com.ubuntu.cosmic:def:20187273000
    V
    		CVE-2018-7273 on Ubuntu 18.10 (cosmic) - negligible.
    2018-02-20
    oval:com.ubuntu.trusty:def:20187273000
    V
    		CVE-2018-7273 on Ubuntu 14.04 LTS (trusty) - negligible.
    2018-02-20
    BACK
    linux linux kernel *
    linux linux kernel 4.15.4