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GHSA-xxxq-chmp-67g4

CriticalCVSS 9.8 / 10

Published Jun 26, 2020·Last modified Nov 8, 2023

Affected Components(0)

No affected components available

Description

Impact

Jsrsasign supports RSA PKCS#1 v1.5 (i.e. RSAES-PKCS1-v1_5) and RSA-OAEP encryption and decryption. Its encrypted message is represented as BigInteger. When there is a valid encrypted message, a crafted message with prepending zeros can be decrypted by this vulnerability.

If you don't use RSA PKCS1-v1_5 or RSA-OAEP decryption, this vulnerability is not affected.
Risk to forge contents of encrypted message is very low.
Risk to raise memory corruption is low since jsrsasign uses BigInteger class.

Patches

Users using RSA PKCS1-v1_5 or RSA-OAEP decryption should upgrade to 8.0.18.

Workarounds

Reject RSA PKCS1-v1_5 or RSA-OAEP encrypted message with unnecessary prepending zeros.

References

https://nvd.nist.gov/vuln/detail/CVE-2020-14967 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14967 https://vuldb.com/?id.157124 https://kjur.github.io/jsrsasign/api/symbols/KJUR.crypto.Cipher.html#.decrypt https://github.com/kjur/jsrsasign/issues/439

Risk Scores

Base Score

9.8

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.

Threat Intelligence

9.0

Active exploitation in the wild has been confirmed. Immediate patching or mitigation is required.

EPSS

2.59%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit

Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Critical severity

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