Martin Prpic, Red Hat Product Security Team, reports :

Denial of Service due to stack overflow in src/ber-decoder.c.

Integer overflow in the BER decoder src/ber-decoder.c.

Integer overflow in the DN decoder src/dn.c.

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - libksba: integer underflow flaw leading to a heap-based buffer overflow in ksba_oid_to_str()     (CVE-2014-9087)

  - libksba: Out-of-bounds read in _ksba_ber_parse_tl (CVE-2016-4579)

  - ber-decoder.c in Libksba before 1.3.3 does not properly handle decoder stack overflows, which allows     remote attackers to cause a denial of service (abort) via crafted BER data. (CVE-2016-4353)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

This plugin has been deprecated as it does not adhere to established standards for this style of check.

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - libksba: integer underflow flaw leading to a heap-based buffer overflow in ksba_oid_to_str()     (CVE-2014-9087)

  - libksba: Out-of-bounds read in _ksba_ber_parse_tl (CVE-2016-4579)

  - ber-decoder.c in Libksba before 1.3.3 does not properly handle decoder stack overflows, which allows     remote attackers to cause a denial of service (abort) via crafted BER data. (CVE-2016-4353)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-2982-1 advisory.

    Hanno Bck discovered that Libksba incorrectly handled decoding certain BER data. An attacker could use     this issue to cause Libksba to crash, resulting in a denial of service. This issue only applied to Ubuntu     12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-4353)

    Hanno Bck discovered that Libksba incorrectly handled decoding certain BER data. An attacker could use     this issue to cause Libksba to crash, resulting in a denial of service, or possibly execute arbitrary     code. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-4354, CVE-2016-4355)

    Hanno Bck discovered that Libksba incorrectly handled incorrect utf-8 strings when decoding certain DN     data. An attacker could use this issue to cause Libksba to crash, resulting in a denial of service, or     possibly execute arbitrary code. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS.
    (CVE-2016-4356)

    Pascal Cuoq discovered that Libksba incorrectly handled incorrect utf-8 strings when decoding certain DN     data. An attacker could use this issue to cause Libksba to crash, resulting in a denial of service, or     possibly execute arbitrary code. (CVE-2016-4574)

    Pascal Cuoq discovered that Libksba incorrectly handled decoding certain data. An attacker could use this     issue to cause Libksba to crash, resulting in a denial of service. (CVE-2016-4579)

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 remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - libksba: integer underflow flaw leading to a heap-based buffer overflow in ksba_oid_to_str()     (CVE-2014-9087)

  - libksba: Out-of-bounds read in _ksba_ber_parse_tl (CVE-2016-4579)

  - ber-decoder.c in Libksba before 1.3.3 does not properly handle decoder stack overflows, which allows     remote attackers to cause a denial of service (abort) via crafted BER data. (CVE-2016-4353)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

ID	Name	Product	Family	Published	Updated	Severity
90848	FreeBSD : libksba -- local denial of service vulnerabilities (a1134048-10c6-11e6-94fa-002590263bf5)	Nessus	FreeBSD Local Security Checks	5/3/2016	1/4/2021	high
198812	RHEL 7 : libksba (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	6/3/2024	6/3/2024	high
195566	RHEL 7 : libksba (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	5/11/2024	5/31/2024	high
198793	RHEL 5 : libksba (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	6/3/2024	6/3/2024	high
91220	Ubuntu 14.04 LTS / 16.04 LTS : Libksba vulnerabilities (USN-2982-1)	Nessus	Ubuntu Local Security Checks	5/18/2016	8/27/2024	high
195580	RHEL 5 : libksba (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	5/11/2024	5/31/2024	high
198826	RHEL 6 : libksba (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	6/3/2024	6/3/2024	high
195515	RHEL 6 : libksba (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	5/11/2024	5/31/2024	critical

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