Summary
USN-8678-1 fixed vulnerabilities in OpenSSL. This update provides the
corresponding fix for OpenSSL and OpenSSL 1.0 on Ubuntu 14.04 LTS,
Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS.
In addition, this update also fixes the following issues that were
not previously addressed in those releases:
It was discovered that OpenSSL incorrectly handled TLS handshake
message buffering. A remote attacker could possibly use this issue to
cause OpenSSL to consume excessive memory, leading to a denial of
service. (LP: #2161371)
It was discovered that OpenSSL incorrectly handled session cache
management when processing TLSv1.3 sessions. A remote attacker could
possibly use this issue to cause OpenSSL to consume excessive memory,
leading to a denial of service. This issue only affected OpenSSL 1.1.1
on Ubuntu 18.04 LTS. (CVE-2024-2511)
It was discovered that OpenSSL incorrectly handled the SSL_select_next_proto
function when called with an empty client protocol list. A remote attacker
could possibly use this issue to cause OpenSSL to disclose private memory
contents to the peer, leading to a loss of confidentiality. This issue
only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2024-5535)
Original advisory details:
It was discovered that OpenSSL incorrectly handled buffering of DTLS
records for a future epoch. A remote attacker could possibly use this issue
to cause OpenSSL to use excessive resources, leading to a denial of
service. (CVE-2026-54874)
It was discovered that OpenSSL incorrectly handled CMS key unwrapping. A
remote attacker could possibly use this issue to cause a heap buffer
overflow, leading to a denial of service or arbitrary code execution.
(CVE-2026-63072)
Fixed packages 5
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · Pro 14.04 LTS Pro:14.04:LTS | openssl | 1.0.1f-1ubuntu2.27+esm16 |
| Ubuntu · Pro 16.04 LTS Pro:16.04:LTS | openssl | 1.0.2g-1ubuntu4.20+esm18 |
| Ubuntu · Pro 18.04 LTS Pro:18.04:LTS | openssl | 1.1.1-1ubuntu2.1~18.04.23+esm10 |
| Ubuntu · Pro 18.04 LTS Pro:18.04:LTS | openssl1.0 | 1.0.2n-1ubuntu5.13+esm6 |
| Ubuntu · Pro 20.04 LTS Pro:20.04:LTS | openssl | 1.1.1f-1ubuntu2.24+esm5 |
Vulnerabilities 4
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Critical 9.1CVE-2024-5535 Public exploit
SSL_select_next_proto buffer overread
Issue summary: Calling the OpenSSL API function SSL_select_next_proto with an empty supported client protocols buffer may cause a crash or memory contents to be sent to the peer. Impact summary: A buffer overread can have a range of potential consequences suc…
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High 7.5
Excessive Memory Use Buffering DTLS Records for a Future Epoch
Issue summary: Receiving a DTLS record for a future epoch while a handshake is in progress causes OpenSSL to buffer far more memory than the record itself requires. Impact summary: A peer can use a small amount of network traffic to make an OpenSSL DTLS endpo…
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High 7.5CVE-2026-63072 Public exploit
Heap Buffer Overflow in CMS Key Unwrapping
Issue summary: OpenSSL CMS decryption sizes the key-unwrap output buffer based on querying the unwrapped key size, but the AES-WRAP-PAD unwrap primitive can write and cleanse more bytes than that query reports, causing an 8-byte out-of-bounds heap write. Impa…
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Medium 5.9CVE-2024-2511 EPSS 59%
Unbounded memory growth with session handling in TLSv1.3
Issue summary: Some non-default TLS server configurations can cause unbounded memory growth when processing TLSv1.3 sessions Impact summary: An attacker may exploit certain server configurations to trigger unbounded memory growth that would lead to a Denial o…