CVE-2013-7372

Public Exploit

Description

The engineNextBytes function in classlib/modules/security/src/main/java/common/org/apache/harmony/security/provider/crypto/SHA1PRNG_SecureRandomImpl.java in the SecureRandom implementation in Apache Harmony through 6.0M3, as used in the Java Cryptography Architecture (JCA) in Android before 4.4 and other products, when no seed is provided by the user, uses an incorrect offset value, which makes it easier for attackers to defeat cryptographic protection mechanisms by leveraging the resulting PRNG predictability, as exploited in the wild against Bitcoin wallet applications in August 2013.

Category

5.0
CVSS
Severity: Medium
CVSS 2.0 •
EPSS 0.84% Top 30%
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.nds.rub.de/media/nds/veroeffentlichungen/2013/03/25/paper_2.pdf exploit
https://android.googlesource.com/platform/libcore/+/kitkat-release/luni/src/main/java/org/apache/harmony/security/provider/crypto/SHA1PRNG_SecureRandomImpl.java patch
https://bitcoin.org/en/alert/2013-08-11-android
http://android-developers.blogspot.com.au/2013/08/some-securerandom-thoughts.html patch

Frequently Asked Questions

What is the severity of CVE-2013-7372?
CVE-2013-7372 has been scored as a medium severity vulnerability.
How to fix CVE-2013-7372?
To fix CVE-2013-7372, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2013-7372 being actively exploited in the wild?
It is possible that CVE-2013-7372 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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