#VU40079 Improper access control in Opensuse and Fedora - CVE-2016-6323

Vulnerability identifier: #VU40079

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-6323

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Opensuse
Operating systems & Components / Operating system
Fedora
Operating systems & Components / Operating system

Vendor: SUSE
Fedoraproject

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The makecontext function in the GNU C Library (aka glibc or libc6) before 2.25 creates execution contexts incompatible with the unwinder on ARM EABI (32-bit) platforms, which might allow context-dependent attackers to cause a denial of service (hang), as demonstrated by applications compiled using gccgo, related to backtrace generation.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Opensuse: 13.2

Fedora: 13.2 - 25

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External links
https://lists.opensuse.org/opensuse-updates/2016-10/msg00009.html
https://www.openwall.com/lists/oss-security/2016/08/18/12
https://www.securityfocus.com/bid/92532
https://www-01.ibm.com/support/docview.wss?uid=swg21995039
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KTXSOVCRDGBIB4WCIDAGYYUBESXZ4IGK/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LVWSAZVBTLALXF4SCBPDV3FY6J22DXLZ/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WO7IMEYWZ2WTXGGMZBWWSDCUMFN63XOB/
https://security.gentoo.org/glsa/201706-19
https://sourceware.org/bugzilla/show_bug.cgi?id=20435
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9e2ff6c9cc54c0b4402b8d49e4abe7000fde7617

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.