#VU17377 Input validation error in Glibc - CVE-2019-7309

Vulnerability identifier: #VU17377

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-7309

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

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

Vendor: GNU

Description

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

The vulnerability exists due to the memcmp function for the x32 architecture can incorrectly return zero (indicating that the inputs are equal) when the RDX most significant bit is mishandled. A local attacker can supply specially crafted input and cause the application to crash.

Mitigation
Update to version 2.30, when available.

Vulnerable software versions

Glibc: 2.0 - 2.29

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External links
https://sourceware.org/bugzilla/show_bug.cgi?id=24155
https://sourceware.org/ml/libc-alpha/2019-02/msg00041.html

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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.