In YARA 3.8.1, bytecode in a specially crafted compiled rule can read uninitialized data from VM scratch memory in libyara/exec.c. This can allow attackers to discover addresses in the real stack (not the YARA virtual stack).

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 YARA 3.8.1, bytecode in a specially crafted compiled rule can read uninitialized data from VM scratch     memory in libyara/exec.c. This can allow attackers to discover addresses in the real stack (not the YARA     virtual stack). (CVE-2018-19974)

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

bugfix bump to 3.10.0

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

update to the bugfix release 3.9.0

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

ID	Name	Product	Family	Severity
301679	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : YARA vulnerabilities (USN-8080-1)	Nessus	Ubuntu Local Security Checks	critical
251279	Linux Distros Unpatched Vulnerability : CVE-2018-19974	Nessus	Misc.	medium
129637	Fedora 30 : yara (2019-a00b4760a0)	Nessus	Fedora Local Security Checks	medium
124536	Fedora 30 : python-yara / yara (2019-c3627a0e7a)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2018-19974

medium

Tenable Plugins

critical

medium

medium

medium