CVE-2016-5255 - Use After Free

Severity

68%

Complexity

86%

Confidentiality

106%

Use-after-free vulnerability in the js::PreliminaryObjectArray::sweep function in Mozilla Firefox before 48.0 allows remote attackers to execute arbitrary code via crafted JavaScript that is mishandled during incremental garbage collection.

Use-after-free vulnerability in the js::PreliminaryObjectArray::sweep function in Mozilla Firefox before 48.0 allows remote attackers to execute arbitrary code via crafted JavaScript that is mishandled during incremental garbage collection.

CVSS 3.0 Base Score 8.8. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 6.8. CVSS Attack Vector: network. CVSS Attack Complexity: medium. CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:P/A:P).

Demo Examples

Use After Free

CWE-416

The following example demonstrates the weakness.


               
}
free(buf3R2);

Use After Free

CWE-416

The following code illustrates a use after free error:


               
}
free(ptr);
logError("operation aborted before commit", ptr);

When an error occurs, the pointer is immediately freed. However, this pointer is later incorrectly used in the logError function.

Overview

First reported 8 years ago

2016-08-05 01:59:00

Last updated 7 years ago

2017-08-16 01:29:00

Affected Software

Mozilla Firefox

References

openSUSE-SU-2016:1964

openSUSE-SU-2016:2026

http://www.mozilla.org/security/announce/2016/mfsa2016-71.html

Vendor Advisory

92260

1036508

USN-3044-1

https://bugzilla.mozilla.org/show_bug.cgi?id=1212356

Issue Tracking, Permissions Required

GLSA-201701-15

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