OpenSIPS up to 3.1.6/3.2.3 SDP Body denial of service

Summaryinfo

A vulnerability has been found in OpenSIPS up to 3.1.6/3.2.3 and classified as problematic. The affected element is an unknown function of the component SDP Body Handler. The manipulation leads to denial of service. This vulnerability is listed as CVE-2023-27600. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in OpenSIPS up to 3.1.6/3.2.3. It has been rated as problematic. This issue affects an unknown part of the component SDP Body Handler. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. The summary by CVE is:

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Prior to versions 3.1.7 and 3.2.4, OpenSIPS crashes when a malformed SDP body is received and is processed by the `delete_sdp_line` function in the sipmsgops module. This issue can be reproduced by calling the function with an SDP body that does not terminate by a line feed (i.e. `\n`). The vulnerability was found while performing black-box fuzzing against an OpenSIPS server running a configuration that made use of the functions `codec_delete_except_re` and `codec_delete_re`. The same issue was also discovered while performing coverage guided fuzzing on the function `codec_delete_except_re`. The crash happens because the function `delete_sdp_line` expects that an SDP line is terminated by a line feed (`\n`). By abusing this vulnerability, an attacker is able to crash the server. It affects configurations containing functions that rely on the affected code, such as the function `codec_delete_except_re`. Due to the sanity check that is performed in the `del_lump` function, exploitation of this issue will generate an `abort` in the lumps processing function, resulting in a Denial of Service. This issue is patched in versions 3.1.7 and 3.2.4.

The weakness was presented 03/16/2023 as GHSA-67w7-g4j8-3wcx. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2023-27600 since 03/04/2023. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 3.1.7 or 3.2.4 eliminates this vulnerability. Applying the patch c6ab3bb406c447e30c7d33a1a8970048b4612100 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• OpenSIPS

Version

• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.1.6
• 3.2.0
• 3.2.1
• 3.2.2
• 3.2.3

License

• open-source

Website

• Product: https://github.com/OpenSIPS/opensips/

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CPE 2.2info

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