CVE-2017-17817 - Use After Free

Severity

43%

Complexity

86%

Confidentiality

48%

In Netwide Assembler (NASM) 2.14rc0, there is a use-after-free in pp_verror in asm/preproc.c that will cause a remote denial of service attack.

In Netwide Assembler (NASM) 2.14rc0, there is a use-after-free in pp_verror in asm/preproc.c that will cause a remote denial of service attack.

CVSS 3.0 Base Score 5.5. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).

CVSS 2.0 Base Score 4.3. CVSS Attack Vector: network. CVSS Attack Complexity: medium. CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/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 7 years ago

2017-12-21 03:29:00

Last updated 5 years ago

2019-03-26 15:45:00

Affected Software

NASM Netwide Assembler 2.14 Release Candidate 0

2.14

Canonical Ubuntu Linux 14.04 LTS (Long-Term Support)

14.04

References

https://bugzilla.nasm.us/show_bug.cgi?id=3392427

Exploit, Issue Tracking, Third Party Advisory, VDB Entry

USN-3694-1

Third Party Advisory

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