Security restrictoins bypass in GNOME GLib



| Updated: 2021-03-15
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-27218
CWE-ID CWE-681
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Gnome GLib
Universal components / Libraries / Libraries used by multiple products

Vendor Gnome Development Team

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Incorrect Conversion between Numeric Types

EUVDB-ID: #VU51455

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-27218

CWE-ID: CWE-681 - Incorrect Conversion between Numeric Types

Exploit availability: No

Description

The vulnerability allows a local user to bypass implemented security restrictions.

The vulnerability exists due to incorrect conversion between numeric types in Gnome Glib. If g_byte_array_new_take() was called with a buffer of 4GB or more on a 64-bit platform, the length would be truncated modulo 2**32, causing unintended length truncation.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Gnome GLib: 2.66.0 - 2.67.3

CPE2.3 External links

https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1942
https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1944
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772@%3Cdev.mina.apache.org%3E


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.



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