CVE-2021-29505

Impact

The vulnerability may allow a remote attacker has sufficient rights to execute commands of the host only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types.

Patches

If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.17.

Workarounds

See workarounds for the different versions covering all CVEs.

References

See full information about the nature of the vulnerability and the steps to reproduce it in XStream's documentation for CVE-2021-29505.

Credits

V3geB1rd, white hat hacker from Tencent Security Response Center found and reported the issue to XStream and provided the required information to reproduce it.

For more information

If you have any questions or comments about this advisory:

• Open an issue in XStream
• Email us at XStream Google Group

XStream is a simple library to serialize objects to XML and back again. A high level facade is supplied that simplifies common use cases. Custom objects can be serialized without need for specifying mappings. Speed and low memory footprint are a crucial part of the design, making it suitable for large object graphs or systems with high message throughput. No information is duplicated that can be obtained via reflection. This results in XML that is easier to read for humans and more compact than native Java serialization. XStream serializes internal fields, including private and final. Supports non-public and inner classes. Classes are not required to have default constructor. Duplicate references encountered in the object-model will be maintained. Supports circular references. By implementing an interface, XStream can serialize directly to/from any tree structure (not just XML). Strategies can be registered allowing customization of how particular types are represented as XML. When an exception occurs due to malformed XML, detailed diagnostics are provided to help isolate and fix the problem.

Security Fix(es):

The processed stream at unmarshalling time contains type information to recreate the formerly written objects. XStream creates therefore new instances based on these type information. An attacker can manipulate the processed input stream and replace or inject objects, that result in execution of a local command on the server.(CVE-2021-29505)

XStream is software for serializing Java objects to XML and back again. A vulnerability in XStream versions prior to 1.4.17 may allow a remote attacker has sufficient rights to execute commands of the host only by manipulating the processed input stream. No user who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types is affected. The vulnerability is patched in version 1.4.17.

In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker to allocate 100% CPU time on the target system depending on CPU type or parallel execution of such a payload resulting in a denial of service only by manipulating the processed input stream (CVE-2021-21341).

In XStream before version 1.4.16, there is a vulnerability where the processed stream at unmarshalling time contains type information to recreate the formerly written objects. XStream creates therefore new instances based on these type information. An attacker can manipulate the processed input stream and replace or inject objects, that result in a server-side forgery request (CVE-2021-21342).

In XStream before version 1.4.16, there is a vulnerability where the processed stream at unmarshalling time contains type information to recreate the formerly written objects. XStream creates therefore new instances based on these type information. An attacker can manipulate the processed input stream and replace or inject objects, that result in the deletion of a file on the local host (CVE-2021-21343).

In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker to load and execute arbitrary code from a remote host only by manipulating the processed input stream (CVE-2021-21344).

In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker who has sufficient rights to execute commands of the host only by manipulating the processed input stream (CVE-2021-21345).

In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker to load and execute arbitrary code from a remote host only by manipulating the processed input stream (CVE-2021-21346).

In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker to load and execute arbitrary code from a remote host only by manipulating the processed input stream (CVE-2021-21347).

In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker to occupy a thread that consumes maximum CPU time and will never return (CVE-2021-21348).

In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream (CVE-2021-21349).

In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker to execute arbitrary code only by manipulating the processed input stream (CVE-2021-21350).

In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker to load and execute arbitrary code from a remote host only by manipulating the processed input stream (CVE-2021-21351).

A vulnerability in XStream versions prior to 1.4.17 may allow a remote attacker has sufficient rights to execute commands of the host only by manipulating the processed input stream (CVE-2021-29505).

Theses vulnerabilities are mitigated if user followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types.

This update for xstream fixes the following issues:

Upgrade to 1.4.17

• CVE-2021-29505: Fixed potential code execution when unmarshalling with XStream instances using an uninitialized security framework (bsc#1186651)

This update was imported from the SUSE:SLE-15-SP2:Update update project.

This update for xstream fixes the following issues:

Upgrade to 1.4.17

• CVE-2021-29505: Fixed potential code execution when unmarshalling with XStream instances using an uninitialized security framework (bsc#1186651)

These are all security issues fixed in the xstream-1.4.18-1.1 package on the GA media of openSUSE Tumbleweed.

This update for xstream fixes the following issues:

Upgrade to 1.4.17

• CVE-2021-29505: Fixed potential code execution when unmarshalling with XStream instances using an uninitialized security framework (bsc#1186651)