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CVE-2014-1512: Mozilla Firefox: Use after free

CVE-2014-1512 has a CVSS v2 base score of 10.0 (the maximum on that scale) and affects Mozilla Firefox, along with 13 other products in NVD’s configuration data. Per its scoring, it can be exploited over the network, without authentication. The scored impact on confidentiality, integrity and availability is the highest available.

Vulnerability description

Use-after-free vulnerability in the TypeObject class in the JavaScript engine in Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and SeaMonkey before 2.25 allows remote attackers to execute arbitrary code by triggering extensive memory consumption while garbage collection is occurring, as demonstrated by improper handling of BumpChunk objects.

Severity breakdown

CVSS v2.0 10.0: AV:N/AC:L/Au:N/C:C/I:C/A:C

• Access vector: Network. Exploitable remotely over the network.
• Access complexity: Low. No special conditions are required.
• Authentication: None. No authentication is needed.
• Confidentiality impact: Complete. Total information disclosure.
• Integrity impact: Complete. Total loss of integrity.
• Availability impact: Complete. Total shutdown of the component.

Underlying weakness

CWE-416: Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.

Affected products

• Mozilla Firefox: before 28.0; from 24.0 before 24.4
• Mozilla Seamonkey: before 2.25
• Mozilla Thunderbird: before 24.4
• Debian Linux: 7.0; 8.0
• Canonical Ubuntu Linux: 12.04; 12.10; 13.10
• Red Hat Enterprise Linux Desktop: 5.0; 6.0
• Red Hat Enterprise Linux Eus: 6.5
• Red Hat Enterprise Linux Server: 5.0; 6.0
• Red Hat Enterprise Linux Server Aus: 6.5
• Red Hat Enterprise Linux Server Eus: 6.5
• Red Hat Enterprise Linux Server Tus: 6.5
• Red Hat Enterprise Linux Workstation: 5.0; 6.0
• Suse Linux Enterprise Software Development Kit: 11.0 sp3
• Opensuse: 11.4; 12.3; 13.1
• Suse Linux Enterprise Desktop: 11 sp3

References

• http://www.mozilla.org/security/announce/2014/mfsa2014-30.html
• https://bugzilla.mozilla.org/show_bug.cgi?id=982957
• http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00016.html
• http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00017.html
• http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00022.html
• http://lists.opensuse.org/opensuse-security-announce/2014-04/msg00016.html
• http://rhn.redhat.com/errata/RHSA-2014-0310.html
• http://rhn.redhat.com/errata/RHSA-2014-0316.html
• http://www.debian.org/security/2014/dsa-2881
• http://www.debian.org/security/2014/dsa-2911
• http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
• http://www.securityfocus.com/bid/66209
• http://www.ubuntu.com/usn/USN-2151-1
• https://security.gentoo.org/glsa/201504-01