Privilege escalation in Oracle Solaris

1) Privilege escalation

EUVDB-ID: #VU14010

Risk: Low

CVSSv3.1: 8.3 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:U/RC:C]

CVE-ID: CVE-2018-2892

CWE-ID: CWE-119 - Memory corruption

Exploit availability: Yes

Description

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

The weakness exists in the Oracle Solaris AVS kernel component due to a signedness bug in the bounds checking of the ‘SDBC_TEST_INIT’ ioctlcode sent to the ‘/dev/sdbc‘ device. A local attacker can perform a special call to copyin() with a user controllable destination pointer and length, facilitate an arbitrary kernel memory overwrite, and execute arbitrary code in the context of kernel.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

Oracle has rolled out a security patch after the issue was disclosed, but evidently the problem was not totally addressed.

Vulnerable software versions

Oracle Solaris: 10 - 11.3

External links

http://www.trustwave.com/Resources/Security-Advisories/Advisories/TWSL2018-007/?fid=11510

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.