#VU17106 Input validation error in Glibc - CVE-2019-6488

Vulnerability identifier: #VU17106

Vulnerability risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-6488

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

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

Vendor: GNU

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in __memmove_avx_unaligned_erms in sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S during a memcpy due to application that runs on  the x32 architecture incorrectly attempts to use a 64-bit register for size_t in assembly codes. A remote attacker can pass specially crafted data to the application using an affected library and cause segmentation fault.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Glibc: 1.00 - 2.28

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External links
https://sourceware.org/bugzilla/show_bug.cgi?id=24097

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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.