#VU30594 Input validation error in GnuPG - CVE-2015-1607

Vulnerability identifier: #VU30594

Vulnerability risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2015-1607

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
GnuPG
Client/Desktop applications / Encryption software

Vendor: GNU

Description

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

kbx/keybox-search.c in GnuPG before 1.4.19, 2.0.x before 2.0.27, and 2.1.x before 2.1.2 does not properly handle bitwise left-shifts, which allows remote attackers to cause a denial of service (invalid read operation) via a crafted keyring file, related to sign extensions and "memcpy with overlapping ranges."

Mitigation
Install update from vendor's website.

Vulnerable software versions

GnuPG: 2.1.0 - 2.1.1

---

External links
https://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=commit;h=2183683bd633818dd031b090b5530951de76f392
https://www.openwall.com/lists/oss-security/2015/02/13/14
https://www.openwall.com/lists/oss-security/2015/02/14/6
https://www.securityfocus.com/bid/72610
https://www.ubuntu.com/usn/usn-2554-1/
https://blog.fuzzing-project.org/5-Multiple-issues-in-GnuPG-found-through-keyring-fuzzing-TFPA-0012015.html
https://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000361.html
https://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000362.html
https://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000363.html

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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