#VU82307 Out-of-bounds write in Libjxl - CVE-2021-45928

Vulnerability identifier: #VU82307

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-45928

CWE-ID: CWE-787

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Libjxl

Vendor: Libjxl Project

Description

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

The vulnerability exists due to a boundary error within the jxl::ModularFrameDecoder::DecodeGroup() function. A local user can trigger an out-of-bounds write and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Libjxl: 0.1 - 0.6.0

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External links
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=36456
https://github.com/libjxl/libjxl/pull/365
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libvips/OSV-2021-1055.yaml
https://github.com/libjxl/libjxl/issues/360
https://github.com/libjxl/libjxl/compare/v0.5...v0.6

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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.