Denial of service in GNU glibc

1) Input validation error

EUVDB-ID: #VU17377

Risk: Low

CVSSv3.1: 3.5 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-7309

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

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

External links

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

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.