CVE-2018-19216 - Use After Free

Severity

68%

Complexity

86%

Confidentiality

106%

Netwide Assembler (NASM) before 2.13.02 has a use-after-free in detoken at asm/preproc.c.

Netwide Assembler (NASM) before 2.13.02 has a use-after-free in detoken at asm/preproc.c.

CVSS 3.0 Base Score 7.8. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/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 6 years ago

2018-11-12 19:29:00

Last updated 6 years ago

2018-12-13 13:11:00

Affected Software

NASM Netwide Assembler -

Debian Linux 8.0 (Jessie)

8.0

Debian Linux 9.0

9.0

References

https://bugzilla.nasm.us/show_bug.cgi?id=3392424

Exploit, Issue Tracking, Third Party Advisory

https://repo.or.cz/nasm.git/commitdiff/9b7ee09abfd426b99aa1ea81d19a3b2818eeabf9

Patch, Third Party Advisory

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