Netwide Assembler 2.14rc0 asm/preproc.c use after free

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

A vulnerability classified as problematic has been found in Netwide Assembler 2.14rc0 (Programming Tool Software). This affects an unknown code of the file asm/preproc.c. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on availability. The summary by CVE is:

In Netwide Assembler (NASM) 2.14rc0, there is a use-after-free in pp_list_one_macro in asm/preproc.c that will lead to a remote denial of service attack, related to mishandling of operand-type errors.

The bug was discovered 08/28/2017. The weakness was released 12/21/2017 as Bug 3392433 as not defined bug report (Bugzilla). The advisory is shared at bugzilla.nasm.us. This vulnerability is uniquely identified as CVE-2017-17820 since 12/20/2017. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, 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). Entries connected to this vulnerability are available at 110951, 110952, 110953 and 110954.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 106079
Nessus Name: Fedora 26 : nasm (2018-48569250d1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 803118
OpenVAS Name: Fedora Update for nasm FEDORA-2018-48569250d1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
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Timelineinfo

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 🔍
05/31/2020 +865 days 🔍

Sourcesinfo

Advisory: Bug 3392433
Status: Not defined

CVE: CVE-2017-17820 (🔍)
See also: 🔍

Entryinfo

Created: 12/21/2017 14:03
Updated: 05/31/2020 22:01
Changes: 12/21/2017 14:03 (74), 05/31/2020 22:01 (3)
Complete: 🔍

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