# CVE-2007-4924: Denial of service in n/a

> Remote attackers can crash the application via malformed SIP packets in the Open Phone Abstraction Library, affecting VoIP services.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 8 Oct 2007
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-55xh-gq2p-rgv2, RHSA-2007:0957

## What is CVE-2007-4924?

CVE-2007-4924 is a medium-severity denial of service vulnerability in n/a, published on 8 Oct 2007. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Open Phone Abstraction Library (opal), as used by (1) Ekiga before 2.0.10 and (2) OpenH323 before 2.2.4, allows remote attackers to cause a denial of service (crash) via an invalid Content-Length header field in Session Initiation Protocol (SIP) packets, which causes a \0 byte to be written to an "attacker-controlled address."

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2007-4924?

It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `opal` | Red Hat:enterprise_linux:5::client | All versions | 0:2.2.2-1.1.0.1 |
| `opal-debuginfo` | Red Hat:enterprise_linux:5::client | All versions | 0:2.2.2-1.1.0.1 |
| `opal` | Red Hat:enterprise_linux:5::client_workstation | All versions | 0:2.2.2-1.1.0.1 |
| `opal-debuginfo` | Red Hat:enterprise_linux:5::client_workstation | All versions | 0:2.2.2-1.1.0.1 |
| `opal-devel` | Red Hat:enterprise_linux:5::client_workstation | All versions | 0:2.2.2-1.1.0.1 |
| `opal` | Red Hat:rhel_productivity:5 | All versions | 0:2.2.2-1.1.0.1 |
| `opal-debuginfo` | Red Hat:rhel_productivity:5 | All versions | 0:2.2.2-1.1.0.1 |
| `opal-devel` | Red Hat:rhel_productivity:5 | All versions | 0:2.2.2-1.1.0.1 |

Products: Ekiga Ekiga, Openh323 Project Openh323.

## How do I fix CVE-2007-4924?

Upgrade to a fixed version.

## Is CVE-2007-4924 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2007-4924 exists.

Public exploit code:

- OpenH323 Opal SIP Protocol - Remote Denial of Service (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2007-1006](https://insights.sbomify.com/CVE-2007-1006/): Memory corruption in n/a (critical 10.0)
- [CVE-2007-1007](https://insights.sbomify.com/CVE-2007-1007/): Other in n/a (critical 10.0)
- [CVE-2011-1830](https://insights.sbomify.com/CVE-2011-1830/): Ekiga attempts to dlopen /tmp/ekiga_test.so (medium 5.7)
- [CVE-2012-5621](https://insights.sbomify.com/CVE-2012-5621/): Denial of service in n/a (medium 5.0)
- [CVE-2007-4897](https://insights.sbomify.com/CVE-2007-4897/): Denial of service in n/a (medium 5.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2007-4924 and fix it if it is affected.

What it is: CVE-2007-4924 is a medium-severity denial of service vulnerability in n/a, published on 8 Oct 2007. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2007-4924 exists.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2007-4924/ (Markdown: https://insights.sbomify.com/CVE-2007-4924/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2007-4924
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2007-4924
- OSV: https://osv.dev/vulnerability/CVE-2007-4924

---
From sbomify Insights: https://insights.sbomify.com/CVE-2007-4924/
Summaries are generated and may contain mistakes; the official description above is the record.