Vulnerability Details

OpenSSL: Timing-based attacks on SSL/TLS with CBC encryption (CVE-2003-0078) (Linux)

Published: 2021-08-13 07:06:11
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:N/C:P/I:N/A:N

Detection Type:
Remote Banner Unreliable

Solution Type:
Vendor Patch

Summary:
OpenSSL is prone to timing-based attacks on SSL/TLS with CBC encryption.

Detection Method:
Checks if a vulnerable version is present on the target host.

Technical Details:
ssl3_get_record in s3_pkt.c for OpenSSL does not perform a MAC computation if an incorrect block cipher padding is used, which causes an information leak (timing discrepancy) that may make it easier to launch cryptographic attacks that rely on distinguishing between padding and MAC verification errors, possibly leading to extraction of the original plaintext, aka the 'Vaudenay timing attack'.

Impact:
An active attacker can substitute specifically made-up ciphertext blocks for blocks sent by legitimate SSL/TLS parties and measure the time until a response arrives: SSL/TLS includes data authentication to ensure that such modified ciphertext blocks will be rejected by the peer (and the connection aborted), but the attacker may be able to use timing observations to distinguish between two different error cases, namely block cipher padding errors and MAC verification errors. This is sufficient for an adaptive attack that finally can obtain the complete plaintext block.

Affected Versions:
OpenSSL version 0.9.6 through 0.9.6h and 0.9.7.

Recommendations:
Update OpenSSL to version 0.9.6.i, 0.9.7a or later. See the references for more details.

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2003-0078

References:

https://www.openssl.org/news/secadv/20030219.txt

Severity
Medium
CVSS Score
5.0
Published
2021-08-13
Modified
2021-08-13
Category
General

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