CVE-2020-26258
libxstream-java - security update
Description
XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.15, a Server-Side Forgery Request vulnerability can be activated when unmarshalling. The vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.15. The reported vulnerability does not exist if running Java 15 or higher. No user is affected who followed the recommendation to setup XStream's Security Framework with a whitelist! Anyone relying on XStream's default blacklist can immediately switch to a whilelist for the allowed types to avoid the vulnerability. Users of XStream 1.4.14 or below who still want to use XStream default blacklist can use a workaround described in more detailed in the referenced advisories.
How to fix CVE-2020-26258
To remediate CVE-2020-26258, upgrade the affected package to a fixed version below.
- —upgrade to 1.4.15-1 or later
- —upgrade to 1.4.11.1-1+deb9u1 or later
- —upgrade to 1.4.11.1-1+deb10u2 or later
- —upgrade to 1.4.15 or later
Is CVE-2020-26258 being exploited?
Likely — EPSS is 93.7%, placing CVE-2020-26258 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (4)
- from 0, < 1.4.15-1
- from 0, < 1.4.11.1-1+deb9u1
- from 0, < 1.4.11.1-1+deb10u2
- from 0, < 1.4.15
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.3 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N |