CVE-2020-15239 Directory Traversal in xmpp-http-upload
Attackers can read arbitrary files with specific suffixes and bypass authentication or quotas in shared hosting environments via directory traversal.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-15239?
CVE-2020-15239 is a low-severity path traversal vulnerability in horazont xmpp-http-upload, published on 6 Oct 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
In xmpp-http-upload before version 0.4.0, when the GET method is attacked, attackers can read files which have a `.data` suffix and which are accompanied by a JSON file with the `.meta` suffix. This can lead to Information Disclosure and in some shared-hosting scenarios also to circumvention of authentication or other limitations on the outbound (GET) traffic. For example, in a scenario where a single server has multiple instances of the application running (with separate DATA_ROOT settings), an attacker who has knowledge about the directory structure is able to read files from any other instance to which the process has read access. If instances have individual authentication (for example, HTTP authentication via a reverse proxy, source IP based filtering) or other restrictions (such as quotas), attackers may circumvent those limits in such a scenario by using the Directory Traversal to retrieve data from the other instances. If the associated XMPP server (or anyone knowing the SECRET_KEY) is malicious, they can write files outside the DATA_ROOT. The files which are written are constrained to have the `.meta` and the `.data` suffixes; the `.meta` file will contain the JSON with the Content-Type of the original request and the `.data` file will contain the payload. The issue is patched in version 0.4.0.
Weakness: CWE-22
Which versions are affected by CVE-2020-15239?
3 open source packages ship an affected version, including xmpp-http-upload. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
xmpp-http-upload PyPI | All versions | 0.4.0 |
xmpp-http-upload PyPI | All versions | 0.4.0 |
xmpp-http-upload PyPI | All versions | 0.4.0 |
Products include Xmpp-Http-Upload Project Xmpp-Http-Upload.
How do I fix CVE-2020-15239?
Upgrade xmpp-http-upload to 0.4.0 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2020-15239 being exploited?
There is no known exploitation of CVE-2020-15239 in the wild and no public exploit code.
Sources
Also known as GHSA-hwv5-w8gm-fq9f, PYSEC-2020-158.