OpenSSL and SSLeay brute force attack can be used to determine internal PRNG state

openssl-prng-brute-force (6823) The risk level is classified as LowLow Risk

Description:

SSLeay and OpenSSL are open-source implementations of the SSL (Secure Sockets Layer) and TLS (Transport Layer Security) protocols. A design error in SSLeay/OpenSSL could allow a remote attacker to determine the PRNG's (Pseudo-Random Number Generator) internal state. A remote attacker can obtain the output of PRNG requests and use this information to perform a brute force attack to predict future PRNG output.

*CVSS:

Base Score: 3.5
  Access Vector: Remote
  Access Complexity: Low
  Authentication: Not Required
  Confidentiality Impact: Partial
  Integrity Impact: None
  Availability Impact: None
 
Temporal Score: 2.6
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Obtain Information

Remedy:

Upgrade to the latest version of OpenSSL (0.9.6b or later), available from the OpenSSL Web site. See References.

For EnGarde Secure Linux 1.0.1:
Upgrade to the latest version of OpenSSL (0.9.6-1.0.14 or later), as listed in EnGarde Secure Linux Security Advisory ESA-20010709-01. See References.

For Trustix Secure Linux 1.1:
Upgrade to the latest version of OpenSSL (0.9.5a-2tr or later), as listed in Trustix Secure Linux Security Advisory #2001-0012. See References.

For Trustix Secure Linux 1.2:
Upgrade to the latest version of OpenSSL (0.9.6-2tr or later), as listed in Trustix Secure Linux Security Advisory #2001-0012. See References.

For Red Hat Linux 6.2:
Upgrade to the latest version of OpenSSL (0.9.5a-7.6.x or later) as listed in RHSA-2001:051-18. See References.

For Red Hat Linux 7.0 and 7.1:
Upgrade to the latest version of OpenSSL (0.9.5a-9 or later), as listed in RHSA-2001:051-18. See References.

For Mandrake Linux 7.1 and Corporate Server 1.0.1:
Upgrade to the latest verion of OpenSSL (0.9.5a-3.1mdk or later), as listed in MandrakeSoft Security Advisory MDKSA-2001:065 : openssl See References.

For Mandrake Linux 7.2 and Single Network Firewall 7.2:
Upgrade to the latest version of OpenSSL (0.9.5a-8.1mdk or later), as listed in MandrakeSoft Security Advisory MDKSA-2001:065 : openssl See References.

For Mandrake Linux 8.0:
Upgrade to the latest version of OpenSSL (0.9.6-7.1mdk or later), as listed in MandrakeSoft Security Advisory MDKSA-2001:065 : openssl See References.

For NetBSD-current (prior to July 10, 2001):
Upgrade to the latest version of NetBSD-current dated after July 10, 2001, as listed in NetBSD Security Advisory 2001-013. See References.

For NetBSD 1.5 and 1.5.1:
Upgrade to the latest version of NetBSD (1.5.2 or later), or apply the appropriate patch for your system, as listed in NetBSD Security Advisory 2001-013. See References.

For Conectiva Linux 4.1:
Upgrade to the latest version of OpenSSL (0.9.5a-2U41_1cl or later), as listed in Conectiva Linux Announcement CLSA-2001:418. See References.

For Conectiva Linux 4.2:
Upgrade to the latest version of OpenSSL (0.9.5a-2U42_1cl or later), as listed in Conectiva Linux Announcement CLSA-2001:418. See References.

For Conectiva Linux 5.0, prg graficos, and ecommerce:
Upgrade to the latest version of OpenSSL (0.9.5a-2U50_1cl or later), as listed in Conectiva Linux Announcement CLSA-2001:418. See References.

For Conectiva Linux 5.1:
Upgrade to the latest version of OpenSSL (0.9.5a-2U51_1cl or later), as listed in Conectiva Linux Announcement CLSA-2001:418. See References.

For Conectiva Linux 6.0:
Upgrade to the latest version of OpenSSL (0.9.6-4U60_1cl or later), as listed in Conectiva Linux Announcement CLSA-2001:418. See References.

For Conectiva Linux 7.0:
Upgrade to the latest version of OpenSSL (0.9.6a-3U70_1cl or later), as listed in Conectiva Linux Announcement CLSA-2001:418. See References.

For other distributions:
Contact your vendor for patch or upgrade information.

References:

Platforms Affected:

  • Conectiva Linux 4.1
  • Conectiva Linux 4.2
  • Conectiva Linux 5.0
  • Conectiva Linux 5.1
  • Conectiva Linux 6.0
  • Conectiva Linux 7.0
  • Conectiva Linux ecommerce
  • Conectiva Linux prg_graficos
  • EngardeLinux Secure Community 1.0.1
  • FreeBSD FreeBSD 4.0
  • FreeBSD FreeBSD 4.1
  • FreeBSD FreeBSD 4.1.1
  • FreeBSD FreeBSD 4.3
  • MandrakeSoft Mandrake Linux 7.1
  • MandrakeSoft Mandrake Linux 7.2
  • MandrakeSoft Mandrake Linux 8.0
  • MandrakeSoft Mandrake Linux Corporate Server 1.0.1
  • MandrakeSoft Mandrake Single Network Firewall 7.2
  • NetBSD NetBSD 1.5
  • NetBSD NetBSD 1.5.1
  • NetBSD NetBSD CURRENT
  • OpenSSL OpenSSL 0.9.6 Beta3
  • OpenSSL OpenSSL 0.9.6 Beta2
  • OpenSSL OpenSSL 0.9.6 Beta1
  • OpenSSL OpenSSL 0.9.6
  • OpenSSL OpenSSL 0.9.6a
  • RedHat Linux 6.2
  • RedHat Linux 7
  • RedHat Linux 7.1
  • RedHat Linux 7.2
  • RedHat Linux 7.3
  • Trustix Secure Linux 1.01
  • Trustix Secure Linux 1.1
  • Trustix Secure Linux 1.2

Reported:

Jul 10, 2001

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