According to the versions of the libxml2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - There's a flaw in libxml2's xmllint in versions before     2.9.11. 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 in versions before 2.9.11. 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 in versions before 2.9.11. 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 vulnerability found in libxml2 in versions before     2.9.11 shows that it did not propagate errors while     parsing XML mixed content, causing a NULL dereference.
    If an untrusted XML document was parsed in recovery     mode and post-validated, the flaw could be used to     crash the application. The highest threat from this     vulnerability is to system availability.(CVE-2021-3537)

  - This library allows to manipulate XML files. It     includes supportto read, modify and write XML and HTML     files. There is DTDs supportthis includes parsing and     validation even with complex DtDs, eitherat parse time     or later once the document has been modified. The     outputcan be a simple SAX stream or an(CVE-2021-3541)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the libxml2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - This library allows to manipulate XML files. It     includes supportto read, modify and write XML and HTML     files. There is DTDs supportthis includes parsing and     validation even with complex DtDs, eitherat parse time     or later once the document has been modified. The     outputcan be a simple SAX stream or an(CVE-2021-3541)

  - 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 in versions before 2.9.11. 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 vulnerability found in libxml2 in versions before     2.9.11 shows that it did not propagate errors while     parsing XML mixed content, causing a NULL dereference.
    If an untrusted XML document was parsed in recovery     mode and post-validated, the flaw could be used to     crash the application. The highest threat from this     vulnerability is to system availability.(CVE-2021-3537)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the libxml2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - A vulnerability found in libxml2 in versions before     2.9.11 shows that it did not propagate errors while     parsing XML mixed content, causing a NULL dereference.
    If an untrusted XML document was parsed in recovery     mode and post-validated, the flaw could be used to     crash the application. The highest threat from this     vulnerability is to system availability.(CVE-2021-3537)

  - There is a flaw in the xml entity encoding     functionality of libxml2 in versions before 2.9.11. 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 in versions before 2.9.11. 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)

  - This library allows to manipulate XML files. It     includes supportto read, modify and write XML and HTML     files. There is DTDs supportthis includes parsing and     validation even with complex DtDs, eitherat parse time     or later once the document has been modified. The     outputcan be a simple SAX stream or an(CVE-2021-3541)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the libxml2 packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - There's a flaw in libxml2's xmllint in versions before 2.9.11. 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 in versions before 2.9.11. 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 in versions before 2.9.11. 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 vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while     parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery     mode and post-validated, the flaw could be used to crash the application. 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)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

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.

ID	Name	Product	Family	Published	Updated	Severity
152286	EulerOS 2.0 SP9 : libxml2 (EulerOS-SA-2021-2275)	Nessus	Huawei Local Security Checks	8/9/2021	12/6/2023	high
152408	EulerOS 2.0 SP8 : libxml2 (EulerOS-SA-2021-2306)	Nessus	Huawei Local Security Checks	8/10/2021	12/4/2023	high
153086	EulerOS 2.0 SP5 : libxml2 (EulerOS-SA-2021-2339)	Nessus	Huawei Local Security Checks	9/7/2021	12/1/2023	high
157940	EulerOS Virtualization 3.0.6.0 : libxml2 (EulerOS-SA-2022-1082)	Nessus	Huawei Local Security Checks	2/12/2022	11/9/2023	high
175091	Amazon Linux AMI : libxml2 (ALAS-2023-1743)	Nessus	Amazon Linux Local Security Checks	5/4/2023	12/11/2024	critical

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