OpenSSL and SSLeay brute force attack can be used to determine internal PRNG state
| openssl-prng-brute-force (6823) |  Low 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.
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:
- Conectiva Linux Announcement CLSA-2001:418: Several vulnerabilities in the OpenSSL library.
- EnGarde Secure Linux Security Advisory ESA-20010709-01: openssl. (From LinuxSecurity archive)
- FreeBSD Security Advisory FreeBSD-SA-01:51: OpenSSL 0.9.6a and earlier contain flaw in PRNG [REVISED].
- NetBSD Security Advisory 2001-013: OpenSSL PRNG weakness (up to 0.9.6a).
- OpenSSL Security Advisory, 10 July 2001: WEAKNESS OF THE OpenSSL PRNG IN VERSIONS UP TO OpenSSL 0.9.6a.
- OpenSSL Web site: Welcome to the OpenSSL Project.
- Trustix Secure Linux Security Advisory #2001-0012: OpenSSL. (From LinuxSecurity archive)
- BID-3004: OpenSSL PRNG Internal State Disclosure Vulnerability
- CVE-2001-1141: The Pseudo-Random Number Generator (PRNG) in SSLeay and OpenSSL before 0.9.6b allows attackers to use the output of small PRNG requests to determine the internal state information, which could be used by attackers to predict future pseudo-random numbers.
- MDKSA-2001:065: Updated openssl packages fix predictable PRNG vulnerability
- OSVDB ID: 853: OpenSSL PRNG Information Disclosure
- RHSA-2001-051: Updated openssl packages available
- US-CERT VU#131923: OpenSSL PRNG contains design flaw that allows a user to determine internal state and predict future output
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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