Multiple vulnerabilities in Linux Kernel

1) Information disclosure

EUVDB-ID: #VU13069

Risk: Low

CVSSv3.1: 3 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-11508

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a local attacker to obtain potentially sensitive information.

The vulnerability exists in the compat_get_timex function, as defined in the kernel/compat.c source code file due to an uninitialized struct field in compat adjtimex system calls. A local attacker can send a compat adjtimex system call that submits malicious input and access sensitive kernel memory content, which could be used to conduct further attacks.

Mitigation

Update to version 4.16.9.

Vulnerable software versions

Linux kernel: 4.16 - 4.16.8

External links

http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0a0b98734479aa5b3c671d...
http://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.16.9

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

2) Stack-based buffer overflow

EUVDB-ID: #VU13070

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-11506

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a local attacker to cause DoS condition on the target system.

The vulnerability exists in the sr_do_ioctl function, as defined in the drivers/scsi/sr_ioctl.c source code file due to differing buffer sizes in the CDROM layer and the SCSI layer. A local attacker can submit specially crafted input, trigger a stack-based overflow and cause the system to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.16.1 - 4.16.12

External links

http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f7068114d45ec55996b904...

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Memory corruption

EUVDB-ID: #VU13071

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-11412

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a local attacker to gain elevated privileges or cause DoS condition on the target system.

The vulnerability exists due to improper memory operations performed by the ext4_read_inline_data() function, as defined in the fs/ext4/inline.c source code file. A local attacker can mount a customized ext4 filesystem that stores the system.data extended attribute value in a dedicated inode, supply malicious input containing an untrusted length value, trigger memory corruption and gain elevated privileges or cause a DoS condition.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.13 - 4.16.11

External links

http://bugzilla.kernel.org/show_bug.cgi?id=199803

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.