Sofia-SIP up to 1.12.4 Length stun_parse_attribute buffer overflow

Summaryinfo

A vulnerability was found in Sofia-SIP up to 1.12.4. It has been declared as critical. Affected by this issue is the function stun_parse_attribute of the component Length Handler. Executing a manipulation can lead to buffer overflow. This vulnerability is tracked as CVE-2023-22741. The attack can be launched remotely. No exploit exists. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability was found in Sofia-SIP up to 1.12.4 (IP Phone Software). It has been declared as critical. This vulnerability affects the function stun_parse_attribute of the component Length Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Sofia-SIP is an open-source SIP User-Agent library, compliant with the IETF RFC3261 specification. In affected versions Sofia-SIP **lacks both message length and attributes length checks** when it handles STUN packets, leading to controllable heap-over-flow. For example, in stun_parse_attribute(), after we get the attribute's type and length value, the length will be used directly to copy from the heap, regardless of the message's left size. Since network users control the overflowed length, and the data is written to heap chunks later, attackers may achieve remote code execution by heap grooming or other exploitation methods. The bug was introduced 16 years ago in sofia-sip 1.12.4 (plus some patches through 12/21/2006) to in tree libs with git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3774 d0543943-73ff-0310-b7d9-9358b9ac24b2. Users are advised to upgrade. There are no known workarounds for this vulnerability.

The weakness was disclosed 01/20/2023 as GHSA-8599-x7rq-fr54. The advisory is available at github.com. This vulnerability was named CVE-2023-22741 since 01/06/2023. Technical details are known, but there is no available exploit.

Applying the patch da53e4fbcb138b080a75576dd49c1fff2ada2764 is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Type

• IP Phone Software

Name

• Sofia-SIP

Version

• 1.12.0
• 1.12.1
• 1.12.2
• 1.12.3
• 1.12.4

License

• open-source

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