Off-by-One Vulnerability in GNU Libtasn1 Affects ASN.1 Encoding
CVE-2021-46848

9.1CRITICAL

Key Information:

Vendor
Gnu
Status
Libtasn1
Vendor
CVE Published:
24 October 2022

Summary

An off-by-one error in the array size check for the asn1_encode_simple_der function in GNU Libtasn1 versions prior to 4.19.0 can potentially lead to a range of security issues. This flaw allows attackers to exploit the vulnerability by leveraging malformed ASN.1 data, leading to unexpected behavior or potential information disclosure. It's crucial for users to update to the latest version to mitigate risks associated with this vulnerability.

References

https://gitlab.com/gnutls/libtasn1/-/commit/44a700d2051a6...
https://gitlab.com/gnutls/libtasn1/-/issues/32
https://bugs.gentoo.org/866237

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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