NASM 2.14rc0 asm/preproc.c paste_tokens memory corruption

Summaryinfo

A vulnerability, which was classified as critical, was found in NASM 2.14rc0. The affected element is the function paste_tokens of the file asm/preproc.c. The manipulation results in memory corruption. This vulnerability is reported as CVE-2017-17811. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in NASM 2.14rc0 (Programming Tool Software). Affected is the function paste_tokens of the file asm/preproc.c. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In Netwide Assembler (NASM) 2.14rc0, there is a heap-based buffer overflow that will cause a remote denial of service attack, related to a strcpy in paste_tokens in asm/preproc.c, a similar issue to CVE-2017-11111.

The bug was discovered 08/28/2017. The weakness was disclosed 12/21/2017 (Website). The advisory is shared for download at bugzilla.nasm.us. This vulnerability is traded as CVE-2017-17811 since 12/20/2017. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. 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). The entries VDB-110951, VDB-110953, VDB-110954 and VDB-110955 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Programming Tool Software

Name

• NASM

Version

• 2.14rc0

License

• open-source

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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