Multiple vulnerabilities in Linux Kernel



Published: 2017-12-27 | Updated: 2018-08-03
Risk Low
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2017-17862
CVE-2017-17863
CVE-2017-17864
CVE-2017-18344
CWE-ID CWE-20
CWE-190
CWE-401
CWE-125
Exploitation vector Local
Public exploit Public exploit code for vulnerability #4 is available.
Vulnerable software
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Linux kernel
Operating systems & Components / Operating system

Vendor Linux Foundation

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Denial of service

EUVDB-ID: #VU9778

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-2017-17862

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The weakness exists due to kernel/bpf/verifier.c in the Linux kernel improperly explores unreachable code paths, even though it would still be processed by JIT compilers. A local attacker can run a specially crafted application, trigger an improper branch-pruning logic issue and cause the system to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

Update to version 4.14.8.

Vulnerable software versions

Linux kernel: 4.10.0 - 4.14.7

External links

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c131187db2d3fa2f8bf32fdf4e...


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.

2) Privilege escalation

EUVDB-ID: #VU9779

Risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-17863

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists due to kernel/bpf/verifier.c in the Linux kernel does not check the relationship between pointer values and the BPF stack. A local attacker can run a specially crafted application to trigger integer overflow or invalid memory access and execute arbitrary code with root privileges.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.9.1 - 4.9.71

External links

http://anonscm.debian.org/cgit/kernel/linux.git/tree/debian/patches/bugfix/all/bpf-reject-out-of-bo...


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 leak

EUVDB-ID: #VU9780

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-17864

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a local attacker to obtain potentially sensitive information on the target system.

The weakness exists due to kernel/bpf/verifier.c in the Linux kernel mishandles states_equal comparisons between the pointer data type and the UNKNOWN_VALUE data type. A local attacker can trigger a memory leak and obtain potentially sensitive address information.

Mitigation

Update to version 4.14.8.

Vulnerable software versions

Linux kernel: 4.10.0 - 4.14.7

External links

http://github.com/torvalds/linux/commit/179d1c5602997fef5a940c6ddcf31212cbfebd14#diff-3f169a344ebaf...


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.

4) Out-of-bounds read

EUVDB-ID: #VU14184

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-2017-18344

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: Yes

Description

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

The vulnerability exists due to out-of-bounds memory read error in the 'sigevent->sigev_notify' field of show_timer() function in the timer subsystem. A local attacker can obtain potentially sensitive information from system memory.

Mitigation

Update to version 4.14.8.

Vulnerable software versions

Linux kernel: 4.10 - 4.14.7

External links

http://github.com/torvalds/linux/commit/cef31d9af908243421258f1df35a4a644604efbe


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.



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