CVE-2018-18531 Use of Insufficiently Random Values in penggle:kaptcha
Remote attackers can bypass CAPTCHA protections in the Kaptcha library by brute-forcing values generated with a weak random number generator.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2018-18531?
CVE-2018-18531 is a critical vulnerability in n/a, published on 19 Oct 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
text/impl/DefaultTextCreator.java, text/impl/ChineseTextProducer.java, and text/impl/FiveLetterFirstNameTextCreator.java in kaptcha 2.3.2 use the Random (rather than SecureRandom) function for generating CAPTCHA values, which makes it easier for remote attackers to bypass intended access restrictions via a brute-force approach.
Weakness: CWE-330
Which versions are affected by CVE-2018-18531?
2 open source packages ship an affected version, including com.github.penggle:kaptcha. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
com.github.penggle:kaptcha Maven | All versions to 2.3.2 | None |
com.github.penggle:kaptcha Maven | All versions to 2.3.2 | None |
Products include Kaptcha Project Kaptcha.
How do I fix CVE-2018-18531?
No fix has been published for CVE-2018-18531 yet. Limit exposure of the affected software until one is available.
Is CVE-2018-18531 being exploited?
There is no known exploitation of CVE-2018-18531 in the wild and no public exploit code.
Sources
Also known as GHSA-8q89-pwhh-7wfq.