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3.7

OpenSSL and related systems allow TLS downgrade attack

CVE-2015-4000 · published 11 years ago
Summary

The TLS encryption used by OpenSSL, Ubuntu Linux, HP-UX, IBM Content Manager and JRockit can be tricked into using weaker export‑grade keys when a man-in-the-middle changes the negotiation messages. This lets an attacker weaken the security of the connection and potentially read or alter data. Update the software to the latest version or disable export‑grade cipher suites to prevent the downgrade.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
openssl openssl >= 1.0.1, <= 1.0.1m
>= 1.0.2, <= 1.0.2a
<= 1.0.1m
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
canonical ubuntu_linux 12.04
14.04
14.10
15.04
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
hp hp-ux b.11.31
cpe:2.3:o:hp:hp-ux:b.11.31:*:*:*:*:*:*:*
ibm content_manager 8.5
cpe:2.3:a:ibm:content_manager:8.5:*:*:*:*:enterprise:*:*
oracle jrockit r28.3.6
cpe:2.3:a:oracle:jrockit:r28.3.6:*:*:*:*:*:*:*
debian debian_linux 7.0
8.0
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
oracle jdk 1.6.0
1.7.0
1.8.0
cpe:2.3:a:oracle:jdk:1.6.0:update95:*:*:*:*:*:*
oracle jre 1.6.0
1.7.0
1.8.0
cpe:2.3:a:oracle:jre:1.6.0:update_95:*:*:*:*:*:*
suse linux_enterprise_desktop 12
cpe:2.3:o:suse:linux_enterprise_desktop:12:*:*:*:*:*:*:*
suse linux_enterprise_server 11.0
cpe:2.3:o:suse:linux_enterprise_server:11.0:sp4:*:*:*:*:*:*
suse linux_enterprise_software_development_kit 12
cpe:2.3:o:suse:linux_enterprise_software_development_kit:12:*:*:*:*:*:*:*
suse suse_linux_enterprise_server 12
cpe:2.3:o:suse:suse_linux_enterprise_server:12:*:*:*:*:*:*:*
apple iphone_os <= 8.3
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
apple mac_os_x <= 10.10.3
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
mozilla network_security_services 3.19
cpe:2.3:a:mozilla:network_security_services:3.19:*:*:*:*:*:*:*
oracle sparc-opl_service_processor <= 1121
cpe:2.3:a:oracle:sparc-opl_service_processor:*:*:*:*:*:*:*:*
apple safari All versions
cpe:2.3:a:apple:safari:-:*:*:*:*:*:*:*
google chrome All versions
cpe:2.3:a:google:chrome:-:*:*:*:*:*:*:*
microsoft internet_explorer All versions
cpe:2.3:a:microsoft:internet_explorer:-:*:*:*:*:*:*:*
mozilla firefox 38.1.0
39.0
cpe:2.3:a:mozilla:firefox:-:*:*:*:*:*:*:*
opera opera_browser All versions
cpe:2.3:a:opera:opera_browser:-:*:*:*:*:*:*:*
mozilla firefox_esr 31.8
cpe:2.3:a:mozilla:firefox_esr:31.8:*:*:*:*:*:*:*
mozilla seamonkey 2.35
cpe:2.3:a:mozilla:seamonkey:2.35:*:*:*:*:*:*:*
mozilla thunderbird 31.8
38.1
cpe:2.3:a:mozilla:thunderbird:31.8:*:*:*:*:*:*:*
mozilla firefox_os 2.2
cpe:2.3:o:mozilla:firefox_os:2.2:*:*:*:*:*:*:*
Original advisory text
The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to...
The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHE_EXPORT and then rewriting a ServerHello with DHE_EXPORT replaced by DHE, aka the "Logjam" issue.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
3.7 Low
Exploitation
>99% chance of attack within 30 days
Type
CWE-310Cryptographic Issues
CWE-295Improper Certificate Validation
Timeline
Published21 May 2015
Updated30 Sep 2026
First seen29 Sep 2026
Sources
CVE-2015-4000 · NVD
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