CVE-2026-90780
Description
A flaw was found in SIPp. An unauthenticated remote attacker could send specially crafted Session Initiation Protocol (SIP) messages with oversized headers. This could lead to a buffer overflow in the get_header() function, causing the SIPp process to crash. This vulnerability results in a denial of service.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Mitigation
To reduce exposure, restrict network access to the SIPp service to trusted hosts or localhost using firewall rules. For example, to limit access to SIP port 5060 (UDP) from a specific IP range using `firewalld`:
`firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<TRUSTED_IP_RANGE>" port port="5060" protocol="udp" accept'`
`firewall-cmd --reload`
If SIPp is not required, disable the service using `systemctl stop sipp.service` and `systemctl disable sipp.service`. Disabling the service will prevent its functionality. A service restart may be required for network configuration changes to take effect.
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Buffer overflows often can be used to execute arbitrary code, which is usually outside the scope of the product's implicit security policy. This can often be used to subvert any other security service.
Availability
Technical Impact: Modify Memory; DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU)
Buffer overflows generally lead to crashes. Other attacks leading to lack of availability are possible, including putting the product into an infinite loop.
Frequently Asked Questions
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