#VU54109 Out-of-bounds read in hivex - CVE-2021-3504

Vulnerability identifier: #VU54109

Vulnerability risk: Low

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

CVE-ID: CVE-2021-3504

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
hivex
Other software / Other software solutions

Vendor: libguestfs

Description

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

The vulnerability exists due to a boundary condition within the hivex_open() function when processing a Windows Registry (hive) file. A remote attacker can create a specially crafted Windows Registry (hive) file, trick the victim into opening it, trigger out-of-bounds read error and crash the application that us using the affected library.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

hivex: 1.1.0 - 1.3.19

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=1949687
https://lists.debian.org/debian-lts-announce/2021/05/msg00011.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BQXTEACRWYAZVNEOIWIYUFGG4GOXSQ22/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A5BNKNVYFL36P2GBEB5O36LHFRYU575H/

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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.