Out-of-bounds read in libtASN1 - CVE-2015-3622

Vulnerability identifier: #VU7690

CSH Severity: Low

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2015-3622

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause DoS conditions on the target system.

The weakness exists due to an error in the _asn1_extract_der_octet function in lib/decoding.c. A remote attacker can send a specially crafted certificate, trigger out-of-bounds heap read and cause the application to crash.

Successful exploitation of the vulnerability results in denial of service.

libtASN1
Arch Linux
Debian Linux
Gentoo Linux
Red Hat Enterprise Linux Server
Fedora
Ubuntu
libtasn1 (Alpine package)
libtasn1
mingw-libtasn1

Update to version 4.5 or later.

libtasn1 (Alpine package) - addressed in versions 3.6-r1, 3.6-r2
libtasn1 - addressed in versions 4.5-1.fc21, 4.5-1.fc22
mingw-libtasn1 - update to 4.12-1.el7

• http://git.savannah.gnu.org/gitweb/?p=libtasn1.git;a=commit;h=4d4f992826a4962790ecd0cce6fbba4a415ce149

• Red Hat update for GNU libtasn1
• Ubuntu update for Libtasn1
• Arch Linux update for libtasn1
• Debian update for libtasn1-6
• Gentoo update for libtasn1
• Out-of-bounds read in libtasn1 (Alpine package)
• Fedora 22 update for libtasn1
• Fedora 21 update for libtasn1
• Fedora EPEL 7 update for mingw-libtasn1