Remote code execution in GNU Glibc

1) Use-after-free error

EUVDB-ID: #VU11787

Risk: High

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-12133

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists in the DNS stub resolver due to it will solicit large UDP responses from name servers, potentially simplifying off-path DNS spoofing attackers due to IP fragmentation when enabling EDNS support. A remote attacker can trigger use after free and execute arbitrary code.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

Update to version 2.26.

Vulnerable software versions

Glibc: 2.25

External links

http://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d42eed4a044e5e10dfb885cf9891c2518a72a491

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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