The version of libxml2 installed on the remote host is prior to 2.9.1-6.6.42. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2023-1743 advisory.

    parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the     xmlParserHandlePEReference function in the case of a '%' character in a DTD name. (CVE-2017-16931)

    GNOME project libxml2 v2.9.10 has a global buffer over-read vulnerability in xmlEncodeEntitiesInternal at     libxml2/entities.c. The issue has been fixed in commit 50f06b3e. (CVE-2020-24977)

    There's a flaw in libxml2's xmllint. An attacker who is able to submit a crafted file to be processed by     xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity,     and availability. (CVE-2021-3516)

    There is a flaw in the xml entity encoding functionality of libxml2. An attacker who is able to supply a     crafted file to be processed by an application linked with the affected functionality of libxml2 could     trigger an out-of-bounds read. The most likely impact of this flaw is to application availability, with     some potential impact to confidentiality and integrity if an attacker is able to use memory information to     further exploit the application. (CVE-2021-3517)

    There's a flaw in libxml2. An attacker who is able to submit a crafted file to be processed by an     application linked with libxml2 could trigger a use-after-free. The greatest impact from this flaw is to     confidentiality, integrity, and availability. (CVE-2021-3518)

    A NULL pointer dereference flaw was found in libxml2, where it did not propagate errors while parsing XML     mixed content. This flaw causes the application to crash if an untrusted XML document is parsed in     recovery mode and post validated. The highest threat from this vulnerability is to system availability.
    (CVE-2021-3537)

    A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing     protection mechanisms and leading to denial of service. (CVE-2021-3541)

    valid.c in libxml2 before 2.9.13 has a use-after-free of ID and IDREF attributes. (CVE-2022-23308)

    A flaw was found in the libxml2 library in functions used to manipulate the xmlBuf and the xmlBuffer     types. A substantial input causes values to calculate buffer sizes to overflow, resulting in an out-of-     bounds write. (CVE-2022-29824)

    An issue was discovered in libxml2 before 2.10.3. When parsing a multi-gigabyte XML document with the     XML_PARSE_HUGE parser option enabled, several integer counters can overflow. This results in an attempt to     access an array at a negative 2GB offset, typically leading to a segmentation fault. (CVE-2022-40303)

    An issue was discovered in libxml2 before 2.10.3. Certain invalid XML entity definitions can corrupt a     hash table key, potentially leading to subsequent logic errors. In one case, a double-free can be     provoked. (CVE-2022-40304)

    A NULL pointer dereference exists when parsing (invalid) XML schemas in libxml2     xmlSchemaCheckCOSSTDerivedOK (CVE-2023-28484)

    libxml2 Hashing of empty dict strings isn't deterministic. When hashing empty strings which aren't null-     terminated, xmlDictComputeFastKey could produce inconsistent results. This could lead to various logic or     memory errors, including double frees. (CVE-2023-29469)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

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Amazon Linux AMI : libxml2 (ALAS-2023-1743)

critical Nessus Plugin ID 175091

Version 1.2

Version 1.1

Version 1.0

Version 1.2 Dec 11, 2024, 10:15 PM CVSS metrics ("Cvssv4 score" set to 0.0) CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:POC/RL:OF/RC:C") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:P/RL:O/RC:C") CVSSv2 severity (based on None, severity decreased from "High" to "Low") Detection (updated detection logic) Plugin metadata Plugin Feed: 202412112215
Version 1.1 May 5, 2023, 2:01 PM Exploit attributes ("Exploitability ease" changed from "No known exploits are available" to "Exploits are available") Plugin Feed: 202305051401
Version 1.0 May 4, 2023, 2:03 PM New Plugin Feed: 202305041403