Digium Asterisk buffer overflow

Summaryinfo

A vulnerability described as critical has been identified in Digium Asterisk. This issue affects some unknown processing. Such manipulation leads to buffer overflow. This vulnerability is referenced as CVE-2023-37457. It is possible to launch the attack remotely. No exploit is available. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in Digium Asterisk (Communications System) (unknown version). It has been rated as critical. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is availability. CVE summarizes:

Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk versions 18.20.0 and prior, 20.5.0 and prior, and 21.0.0; as well as ceritifed-asterisk 18.9-cert5 and prior, the 'update' functionality of the PJSIP_HEADER dialplan function can exceed the available buffer space for storing the new value of a header. By doing so this can overwrite memory or cause a crash. This is not externally exploitable, unless dialplan is explicitly written to update a header based on data from an outside source. If the 'update' functionality is not used the vulnerability does not occur. A patch is available at commit a1ca0268254374b515fa5992f01340f7717113fa.

The weakness was published 12/15/2023 as GHSA-98rc-4j27-74hh. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2023-37457 since 07/06/2023. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 214468 (Debian dla-3696 : asterisk - security update), which helps to determine the existence of the flaw in a target environment.

Applying the patch a1ca0268254374b515fa5992f01340f7717113fa is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (214468). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Communications System

Vendor

• Digium

Name

• Asterisk

License

• open-source

Website

• Vendor: https://www.digium.com/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

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

Discussion