#VU7135 Memory corruption in Glibc - CVE-2017-1000366

Vulnerability identifier: #VU7135

Vulnerability risk: Medium

CVSSv4.0: 7.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2017-1000366

CWE-ID: CWE-119

Exploitation vector: Local

Exploit availability: Yes

Vulnerable software:
Glibc
Universal components / Libraries / Libraries used by multiple products

Vendor: GNU

Description

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

The vulnerability exists due to memory management errors in implementation of various functions under multiple operating systems. A local or remote attacker can trigger the affected application to process specially crafted LD_LIBRARY_PATH values to manipulate the heap/stack, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Glibc: 1.00 - 2.25

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External links
https://sourceware.org/git/?p=glibc.git;a=commit;h=f6110a8fee2ca36f8e2d2abecf3cba9fa7b8ea7d
https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt

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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.