SB2021090619 - Information disclosure in Botan
Published: September 6, 2021 Updated: August 15, 2022
Security Bulletin ID
SB2021090619
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use of a broken or risky cryptographic algorithm (CVE-ID: CVE-2021-40529)
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to incorrect ElGamal implementation in Botan, which allows plaintext recovery. A remote attacker can perform a cross-configuration attack against OpenPGP and recover encrypted data.
Remediation
Install update from vendor's website.
References
- https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1
- https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2
- https://github.com/randombit/botan/pull/2790
- https://eprint.iacr.org/2021/923
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UPHGYWNJQKWLTUWBNSFB4F66MQDIL3IB/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/72NB4OLD3VHJC3YF3PEP2HKF6BYURPAO/
- https://security.gentoo.org/glsa/202208-14