Out-of-bounds read in Libidn - CVE-2016-6263
Published: September 7, 2016 / Updated: July 28, 2020
Vulnerability identifier: #VU32268
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2016-6263
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The stringprep_utf8_nfkc_normalize function in lib/nfkc.c in libidn before 1.33 allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) via crafted UTF-8 data.
Affected software
Libidn
Gentoo Linux
Fedora
libidn (Alpine package)
mingw-libidn
libidn
IBM Tivoli Storage Manager
Gentoo Linux
Fedora
libidn (Alpine package)
mingw-libidn
libidn
IBM Tivoli Storage Manager
How to mitigate CVE-2016-6263
Install update from vendor's website.
Libidn - update to 1.33
libidn (Alpine package) - update to 1.33-r0
mingw-libidn - addressed in versions 1.33-1.el7, 1.33-1.fc25
libidn - addressed in versions 1.33-1.fc23, 1.33-1.fc24
libidn (Alpine package) - update to 1.33-r0
mingw-libidn - addressed in versions 1.33-1.el7, 1.33-1.fc25
libidn - addressed in versions 1.33-1.fc23, 1.33-1.fc24
External References
- http://git.savannah.gnu.org/cgit/libidn.git/commit/?id=1fbee57ef3c72db2206dd87e4162108b2f425555
- http://lists.opensuse.org/opensuse-updates/2016-08/msg00005.html
- http://lists.opensuse.org/opensuse-updates/2016-08/msg00098.html
- http://www.debian.org/security/2016/dsa-3658
- http://www.openwall.com/lists/oss-security/2016/07/20/6
- http://www.openwall.com/lists/oss-security/2016/07/21/4
- http://www.securityfocus.com/bid/92070
- http://www.ubuntu.com/usn/USN-3068-1
- https://lists.gnu.org/archive/html/help-libidn/2016-07/msg00009.html
- https://security.gentoo.org/glsa/201908-06