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About Snyk
 1. Snyk Vulnerability Database
 2. Maven
 3. com.google.guava:guava




INFORMATION DISCLOSURE AFFECTING COM.GOOGLE.GUAVA:GUAVA PACKAGE, VERSIONS [,
30.0-ANDROID) (30.0-ANDROID, 30.0-JRE)

--------------------------------------------------------------------------------

SEVERITY

Recommended
3.3
low
0
10

CVSS ASSESSMENT MADE BY SNYK'S SECURITY TEAM

Learn more


THREAT INTELLIGENCE


Exploit Maturity
Proof of concept
EPSS
0.06% (26th percentile)

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 * Snyk ID SNYK-JAVA-COMGOOGLEGUAVA-1015415
 * published 23 Oct 2020
 * disclosed 1 Oct 2020
 * credit Jonathan Leitschuh

Report a new vulnerability Found a mistake?

INTRODUCED: 1 OCT 2020

CVE-2020-8908 Open this link in a new tab

CWE-200 Open this link in a new tab

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HOW TO FIX?

There is no fix for com.google.guava:guava. However, in version 30.0 and above,
the vulnerable functionality has been deprecated. In oder to mitigate this
vulnerability, upgrade to version 30.0 or higher and ensure your dependencies
don't use the createTempDir or createTempFile methods.


OVERVIEW

com.google.guava:guava is a set of core libraries that includes new collection
types (such as multimap and multiset,immutable collections, a graph library,
functional types, an in-memory cache and more.

Affected versions of this package are vulnerable to Information Disclosure. The
file permissions on the file created by com.google.common.io.Files.createTempDir
allow an attacker running a malicious program co-resident on the same machine to
steal secrets stored in this directory. This is because, by default, on
unix-like operating systems the /tmp directory is shared between all users, so
if the correct file permissions aren't set by the directory/file creator, the
file becomes readable by all other users on that system.


POC

File guavaTempDir = com.google.common.io.Files.createTempDir();
System.out.println("Guava Temp Dir: " + guavaTempDir.getName());
runLS(guavaTempDir.getParentFile(), guavaTempDir); // Prints the file permissions -> drwxr-xr-x
File child = new File(guavaTempDir, "guava-child.txt");
child.createNewFile();
runLS(guavaTempDir, child); // Prints the file permissions -> -rw-r--r--


For Android developers, choosing a temporary directory API provided by Android
is recommended, such as context.getCacheDir(). For other Java developers, we
recommend migrating to the Java 7 API java.nio.file.Files.createTempDirectory()
which explicitly configures permissions of 700, or configuring the Java
runtime's java.io.tmpdir system property to point to a location whose
permissions are appropriately configured.


REFERENCES

 * GHSA Advisory

 * GitHub Commit

 * GitHub Commit

 * GitHub Issue


CVSS SCORES

version 3.1
Expand this section


SNYK

3.3 low
 * Attack Vector (AV)
   Local
 * Attack Complexity (AC)
   Low
 * Privileges Required (PR)
   Low
 * User Interaction (UI)
   None

 * Scope (S)
   Unchanged

 * Confidentiality (C)
   Low
 * Integrity (I)
   None
 * Availability (A)
   None

Expand this section


NVD

3.3 low
Expand this section


SUSE

4 medium
Expand this section


RED HAT

3.3 low


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