Buffer overflow in TianoCore edk2

1) Buffer overflow

EUVDB-ID: #VU56490

Risk: Medium

CVSSv4.0: 5.2 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-38575

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in the IScsiHexToBin() function in NetworkPkg/IScsiDxe. A remote attacker with ability to inject data into communication between edk2 and the iSCSI target can execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

edk2: UDK2017 - edk2-stable202105

CPE2.3

• cpe:2.3:h:tianocore:edk2:UDK2017:*:*:*:*:*:*:*
• cpe:2.3:h:tianocore:edk2:UDK2018:*:*:*:*:*:*:*
• cpe:2.3:h:tianocore:edk2:edk2-stable201808:*:*:*:*:*:*:*

External links

https://edk2.groups.io/g/devel/message/76198
https://listman.redhat.com/archives/edk2-devel-archive/2021-June/msg00316.html
https://bugzilla.redhat.com/show_bug.cgi?id=1956284

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.