An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j).
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Advisories
| Source | ID | Title |
|---|---|---|
Debian DLA |
DLA-2751-1 | postgresql-9.6 security update |
Debian DSA |
DSA-4875-1 | openssl security update |
EUVD |
EUVD-2021-1628 | An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j). |
Github GHSA |
GHSA-83mx-573x-5rw9 | openssl-src NULL pointer Dereference in signature_algorithms processing |
Ubuntu USN |
USN-4891-1 | OpenSSL vulnerability |
Ubuntu USN |
USN-5038-1 | PostgreSQL vulnerabilities |
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
No history.
Projects
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Status: PUBLISHED
Assigner: openssl
Published:
Updated: 2024-09-17T03:43:55.497Z
Reserved: 2021-03-17T00:00:00
Link: CVE-2021-3449
No data.
Status : Modified
Published: 2021-03-25T15:15:13.450
Modified: 2024-11-21T06:21:33.050
Link: CVE-2021-3449
OpenCVE Enrichment
No data.
Weaknesses
Debian DLA
Debian DSA
EUVD
Github GHSA
Ubuntu USN