#VU40662 Input validation error in libunwind - CVE-2015-3239

Vulnerability identifier: #VU40662

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-3239

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libunwind
Other software / Other software solutions

Vendor: LibTMCG

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

Off-by-one error in the dwarf_to_unw_regnum function in include/dwarf_i.h in libunwind 1.1 allows local users to have unspecified impact via invalid dwarf opcodes.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libunwind: 1.1

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External links
https://git.savannah.gnu.org/cgit/libunwind.git/commit/?id=396b6c7ab737e2bff244d640601c436a26260ca1
https://rhn.redhat.com/errata/RHSA-2015-1675.html
https://rhn.redhat.com/errata/RHSA-2015-1768.html
https://rhn.redhat.com/errata/RHSA-2015-1769.html
https://www.securityfocus.com/bid/76707
https://bugzilla.redhat.com/show_bug.cgi?id=1232265

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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.