QNAP firmware updates fix Apache HTTP vulnerabilities in its NAS

Taiwanese vendor QNAP warns users to update their NAS Firmware to fix Apache HTTP flaws addressed in the Apache HTTP server last month.

Taiwanese vendor QNAP warns users to update their NAS Firmware to address Apache HTTP vulnerabilities, tracked as CVE-2022-22721 and CVE-2022-23943, addressed in the Apache HTTP server in March.

“While CVE-2022-22719 and CVE-2022-22720 do not affect QNAP products, CVE-2022-22721 affects 32-bit QNAP NAS models, and CVE-2022-23943 affects users who have enabled mod_sed in Apache HTTP Server on their QNAP device.” reads the advisory published by the vendor.

The flaws are a possible buffer overflow in LimitXMLRequestBody and an out-of-bounds write vulnerability in mod_sed of Apache HTTP. Both vulnerabilities received a CVSS severity score of 9.8 and affect Apache HTTP Server versions 2.4.52 and earlier. Apache foundation addressed the issue in March 2022 with the release of version 2.4.53.

Below are the descriptions for both issues reported in the changelog:

CVE-2022-22721 – Possible buffer overflow with very large or unlimited LimitXMLRequestBody (cve.mitre.org) If LimitXMLRequestBody is set to allow request bodies larger than 350MB (defaults to 1M) on 32 bit systems an integer overflow happens which later causes out of bounds writes. This issue affects Apache HTTP Server 2.4.52 and earlier. Credits: Anonymous working with Trend Micro Zero Day Initiative.
CVE-2022-23943 – Read/write beyond bounds (cve.mitre.org) Out-of-bounds Write vulnerability in mod_sed of Apache HTTP Server allows an attacker to overwrite heap memory with possibly attacker provided data. This issue affects Apache HTTP Server 2.4 version 2.4.52 and prior versions. Credits: Ronald Crane (Zippenhop LLC).

The company also recommends mitigating CVE-2022-22721 by keeping the default value “1M” for LimitXMLRequestBody, while CVE-2022-23943 can be mitigated by disabling mod_sed.

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Pierluigi Paganini

(SecurityAffairs – hacking, QNAP)

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Pierluigi Paganini

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer. Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US. Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.