#VU27334 Out-of-bounds write in musl libc - CVE-2019-14697

Vulnerability identifier: #VU27334

Vulnerability risk: Medium

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-14697

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
musl libc
Universal components / Libraries / Libraries used by multiple products

Vendor: GNU

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to x87 floating-point stack adjustment imbalance, related to the math/i386/ directory. A remote attacker can pass specially crafted data to the application, trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

musl libc: 0.5.0 - 1.1.23

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External links
https://www.openwall.com/lists/oss-security/2019/08/06/4
https://security.gentoo.org/glsa/202003-13
https://www.openwall.com/lists/musl/2019/08/06/1

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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.