Detections
Analytics
OpenSSL 1.0.1 < 1.0.1n Multiple Vulnerabilities (Logjam)
medium Nessus Plugin ID 84153
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Synopsis
The remote service is affected by multiple vulnerabilities.Description
According to its banner, the remote web server uses a version of OpenSSL 1.0.1 prior to 1.0.1n. The OpenSSL library is, therefore, affected by the following vulnerabilities :- A denial of service vulnerability exists when processing an ECParameters structure due to an infinite loop that occurs when a specified curve is over a malformed binary polynomial field. A remote attacker can exploit this to perform a denial of service against any system that processes public keys, certificate requests, or certificates. This includes TLS clients and TLS servers with client authentication enabled. (CVE-2015-1788)
- A denial of service vulnerability exists due to improper validation of the content and length of the ASN1_TIME string by the X509_cmp_time() function. A remote attacker can exploit this, via a malformed certificate and CRLs of various sizes, to cause a segmentation fault, resulting in a denial of service condition. TLS clients that verify CRLs are affected.
TLS clients and servers with client authentication enabled may be affected if they use custom verification callbacks. (CVE-2015-1789)
- A NULL pointer dereference flaw exists in the PKCS#7 parsing code due to incorrect handling of missing inner 'EncryptedContent'. This allows a remote attacker, via specially crafted ASN.1-encoded PKCS#7 blobs with missing content, to cause a denial of service condition or other potential unspecified impacts. (CVE-2015-1790)
- A double-free error exists due to a race condition that occurs when a NewSessionTicket is received by a multi-threaded client when attempting to reuse a previous ticket. (CVE-2015-1791)
- A denial of service vulnerability exists in the CMS code due to an infinite loop that occurs when verifying a signedData message. A remote attacker can exploit this to cause a denial of service condition. (CVE-2015-1792)
- A man-in-the-middle vulnerability exists, known as Logjam, due to a flaw in the SSL/TLS protocol. A remote attacker can exploit this flaw to downgrade connections using ephemeral Diffie-Hellman key exchange to 512-bit export-grade cryptography. (CVE-2015-4000)
Solution
Upgrade to OpenSSL 1.0.1n or later.See Also
Plugin Details
Severity: Medium
ID: 84153
File Name: openssl_1_0_1n.nasl
Version: 1.10
Type: combined
Agent: windows, macosx, unix
Family: Web Servers
Published: 6/12/2015
Updated: 8/21/2023
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.9
CVSS v2
Risk Factor: Medium
Base Score: 6.8
Temporal Score: 5
Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS Score Source: CVE-2015-1791
Vulnerability Information
CPE: cpe:/a:openssl:openssl
Required KB Items: installed_sw/OpenSSL
Exploit Ease: No known exploits are available
Patch Publication Date: 6/11/2015
Vulnerability Publication Date: 5/20/2015
Reference Information
CVE: CVE-2015-1788, CVE-2015-1789, CVE-2015-1790, CVE-2015-1791, CVE-2015-1792, CVE-2015-4000