Off-by-one error in the append_utf8_value function in the DN decoder (dn.c) in Libksba before 1.3.4 allows remote attackers to cause a denial of service (out-of-bounds read) via invalid utf-8 encoded data. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-4356.

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.

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.

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.

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

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

  - The append_utf8_value function in the DN decoder (dn.c)     in Libksba before 1.3.3 allows remote attackers to     cause a denial of service (out-of-bounds read) by     clearing the high bit of the byte after invalid utf-8     encoded data.(CVE-2016-4356)

  - Off-by-one error in the append_utf8_value function in     the DN decoder (dn.c) in Libksba before 1.3.4 allows     remote attackers to cause a denial of service     (out-of-bounds read) via invalid utf-8 encoded data.
    NOTE: this vulnerability exists because of an     incomplete fix for CVE-2016-4356.(CVE-2016-4574)

  - Libksba before 1.3.4 allows remote attackers to cause a     denial of service (out-of-bounds read and crash) via     unspecified vectors, related to the 'returned length of     the object from _ksba_ber_parse_tl.'(CVE-2016-4579)

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.

Security fix for minor security issues CVE-2016-4574, CVE-2016-4579.

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.

This update for libksba fixes the following issues :

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

  - CVE-2016-4574: two OOB read access bugs (remote DoS)     (bsc#979261)

Also adding reliability fixes from v1.3.4.

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

This update for libksba fixes the following issues :

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

  - CVE-2016-4574: two OOB read access bugs (remote DoS)     (bsc#979261)

Also adding reliability fixes from v1.3.4.

This update was imported from the SUSE:SLE-12:Update update project.

The following security-related issues were resolved :

Incomplete fix for CVE-2016-4356 (CVE-2016-4574)

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

This update for libksba fixes the following issues :

Security issue fixed :

  - boo#979261: OOB read access bugs remote DoS

  - CVE-2016-4574: off-by-one OOB read access (incomplete     fix for CVE-2016-4356)

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.

ID	Name	Product	Family	Severity
198826	RHEL 6 : libksba (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
198812	RHEL 7 : libksba (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
198793	RHEL 5 : libksba (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
195580	RHEL 5 : libksba (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	high
195566	RHEL 7 : libksba (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	high
195515	RHEL 6 : libksba (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	critical
146660	EulerOS 2.0 SP2 : libksba (EulerOS-SA-2021-1317)	Nessus	Huawei Local Security Checks	high
146120	EulerOS 2.0 SP5 : libksba (EulerOS-SA-2021-1203)	Nessus	Huawei Local Security Checks	high
145213	EulerOS 2.0 SP3 : libksba (EulerOS-SA-2021-1086)	Nessus	Huawei Local Security Checks	high
92214	Fedora 23 : libksba (2016-fd26f713e7)	Nessus	Fedora Local Security Checks	high
92072	Fedora 22 : libksba (2016-28a56c76c1)	Nessus	Fedora Local Security Checks	high
92064	Fedora 24 : libksba (2016-1bcec8b80d)	Nessus	Fedora Local Security Checks	high
91654	SUSE SLED12 / SLES12 Security Update : libksba (SUSE-SU-2016:1510-1)	Nessus	SuSE Local Security Checks	high
91653	SUSE SLES11 Security Update : libksba (SUSE-SU-2016:1509-1)	Nessus	SuSE Local Security Checks	high
91532	openSUSE Security Update : libksba (openSUSE-2016-697)	Nessus	SuSE Local Security Checks	high
91471	Amazon Linux AMI : libksba (ALAS-2016-712)	Nessus	Amazon Linux Local Security Checks	high
91289	openSUSE Security Update : libksba (openSUSE-2016-624)	Nessus	SuSE Local Security Checks	high
91220	Ubuntu 14.04 LTS / 16.04 LTS : Libksba vulnerabilities (USN-2982-1)	Nessus	Ubuntu Local Security Checks	high

Detections

Analytics

CVE-2016-4574

high

Tenable Plugins

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critical

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