In the macho_parse_file functionality in macho/macho.c of YARA 3.11.0, command_size may be inconsistent with the real size. A specially crafted MachO file can cause an out-of-bounds memory access, resulting in Denial of Service (application crash) or potential code execution.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8080-1 advisory.

    Kamil Frankowicz discovered that a number of YARA's functions generated memory exceptions when processing     specially crafted rules or files. A remote attacker could possibly use these issues to cause YARA to     crash, resulting in a denial of service. These issues only affected Ubuntu 16.04 LTS. (CVE-2016-10211,     CVE-2017-5923, CVE-2017-5924, CVE-2017-8294, CVE-2017-8929, CVE-2017-9304, CVE-2017-9438, CVE-2017-9465)

    Jurriaan Bremer discovered that YARA's yr_object_array_set_limit() function could result in a heap buffer     overflow when scanning specially crafted .NET files. A remote attacker could possibly use this issue to     cause YARA to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS.
    (CVE-2017-11328)

    It was discovered that YARA's yr_execute_code() function could cause an out-of-bounds read or write when     parsing specially crafted compiled rule files. A remote attacker could possibly use these issues to cause     YARA to crash, resulting in a denial of service. These issues only affected Ubuntu 16.04 LTS and Ubuntu     18.04 LTS. (CVE-2018-12034, CVE-2018-12035)

    It was discovered that YARA's virtual machine could be escaped in certain instances. A remote attacker     could possibly use these issues to execute arbitrary code. These issues only affected Ubuntu 16.04 LTS and     Ubuntu 18.04 LTS. (CVE-2018-19974, CVE-2018-19975, CVE-2018-19976)

    It was discovered that YARA's macho_parse_file() function would generate an out-of-bounds memory access     error when parsing a specially crafted Mach-O file. A remote attacker could possibly use this issue to     cause YARA to crash, resulting in a denial of service, or execute arbitrary code. This issue only affected     Ubuntu 20.04 LTS. (CVE-2019-19648)

    It was discovered that YARA's macho.c implementation contained several overflow reads, which could be     triggered when parsing specially crafted Mach-O files. A remote attacker could possibly use this issue to     cause YARA to crash, resulting in a denial of service, or to learn sensitive information. This issue only     affected Ubuntu 20.04 LTS. (CVE-2021-3402)

    It was discovered that YARA's yr_set_configuration() function could trigger a buffer overflow when parsing     specially crafted rules. A remote attacker could possibly use this issue to cause YARA to crash, resulting     in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2021-45429)

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

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

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - In the macho_parse_file functionality in macho/macho.c of YARA 3.11.0, command_size may be inconsistent     with the real size. A specially crafted MachO file can cause an out-of-bounds memory access, resulting in     Denial of Service (application crash) or potential code execution. (CVE-2019-19648)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
301679	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : YARA vulnerabilities (USN-8080-1)	Nessus	Ubuntu Local Security Checks	Local	critical
251281	Linux Distros Unpatched Vulnerability : CVE-2019-19648	Nessus	Misc.	Local	high

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CVE-2019-19648

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