#VU72050 Input validation error in HarfBuzz - CVE-2023-25193

Vulnerability identifier: #VU72050

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-25193

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
HarfBuzz
Other software / Other software solutions

Vendor: Freedesktop.org

Description

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

The vulnerability exists due to insufficient validation of user-supplied input in hb-ot-layout-gsubgpos.hh. A remote attacker can use consecutive marks during the process of looking back for base glyphs when attaching marks and perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

HarfBuzz: 0.6.0 - 6.0.0

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External links
https://github.com/harfbuzz/harfbuzz/commit/85be877925ddbf34f74a1229f3ca1716bb6170dc
https://github.com/harfbuzz/harfbuzz/blob/2822b589bc837fae6f66233e2cf2eef0f6ce8470/src/hb-ot-layout-gsubgpos.hh
https://chromium.googlesource.com/chromium/src/+/e1f324aa681af54101c1f2d173d92adb80e37088/DEPS#361

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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.