VDB-110960 · CVE-2017-17819 · Qualys 277216

NASM 2.14rc0 asm/preproc.c find_cc null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in NASM 2.14rc0 (Programming Tool Software). It has been rated as problematic. Affected by this issue is the function find_cc of the file asm/preproc.c. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. CVE summarizes:

In Netwide Assembler (NASM) 2.14rc0, there is an illegal address access in the function find_cc() in asm/preproc.c that will cause a remote denial of service attack, because pointers associated with skip_white_ calls are not validated.

The bug was discovered 08/28/2017. The weakness was published 12/21/2017 (Website). The advisory is shared for download at repo.or.cz. This vulnerability is handled as CVE-2017-17819 since 12/20/2017. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 114 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 106079 (Fedora 26 : nasm (2018-48569250d1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277216 (Fedora Security Update for nasm (FEDORA-2018-b1f3217ae6)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (106079).






CPE 2.3info

CPE 2.2info


VulDB CVSS-B Score: 🔍
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VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
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NVD Base Score: 5.5
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Class: Null pointer dereference
CWE: CWE-476 / CWE-404

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Nessus ID: 106079
Nessus Name: Fedora 26 : nasm (2018-48569250d1)
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OpenVAS ID: 803118
OpenVAS Name: Fedora Update for nasm FEDORA-2018-48569250d1
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Threat Intelligenceinfo

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Recommended: Upgrade
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Patch: repo.or.cz


08/28/2017 🔍
12/20/2017 +114 days 🔍
12/20/2017 +0 days 🔍
12/21/2017 +1 days 🔍
12/21/2017 +0 days 🔍
01/16/2018 +26 days 🔍
01/17/2018 +1 days 🔍
01/18/2023 +1827 days 🔍


Advisory: FEDORA-2018-48569250d1
Status: Not defined

CVE: CVE-2017-17819 (🔍)


Created: 12/21/2017 02:03 PM
Updated: 01/18/2023 04:08 PM
Changes: 12/21/2017 02:03 PM (73), 12/17/2019 10:16 AM (3), 01/18/2023 03:57 PM (5), 01/18/2023 04:02 PM (1), 01/18/2023 04:08 PM (1)
Complete: 🔍
Cache ID: 100:951:40


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