Buffer overflow in GNU Libidn

1) Buffer overflow

EUVDB-ID: #VU32284

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-2059

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The stringprep_utf8_to_ucs4 function in libin before 1.31, as used in jabberd2, allows context-dependent attackers to read system memory and possibly have other unspecified impact via invalid UTF-8 characters in a string, which triggers an out-of-bounds read.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Libidn: 1.0 - 1.30

CPE2.3

• cpe:2.3:a:gnu:libidn:1.0:*:*:*:*:*:*:*
• cpe:2.3:a:gnu:libidn:1.1:*:*:*:*:*:*:*
• cpe:2.3:a:gnu:libidn:1.2:*:*:*:*:*:*:*

External links

https://git.savannah.gnu.org/cgit/libidn.git/commit/?id=2e97c279
https://lists.fedoraproject.org/pipermail/package-announce/2015-July/162537.html
https://lists.fedoraproject.org/pipermail/package-announce/2015-July/162549.html
https://lists.opensuse.org/opensuse-updates/2015-07/msg00042.html
https://lists.opensuse.org/opensuse-updates/2016-08/msg00098.html
https://www.debian.org/security/2016/dsa-3578
https://www.openwall.com/lists/oss-security/2015/02/23/25
https://www.securityfocus.com/bid/72736
https://www.ubuntu.com/usn/USN-3068-1
https://github.com/jabberd2/jabberd2/issues/85

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.