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Fencer Intel
medium 6.4

CVE-2010-1128 json

The Linear Congruential Generator (LCG) in PHP before 5.2.13 does not provide the expected entropy, which makes it easier for context-depen…

published 16y ago modified 4mo ago also EUVD-2010-1159

cvss
6.4
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.1%
EPSS 8.1% chance of exploitation in 30 days, percentile 94%
public exploits
1
Exploit-DB

Summary

The Linear Congruential Generator (LCG) in PHP before 5.2.13 does not provide the expected entropy, which makes it easier for context-dependent attackers to guess values that were intended to be unpredictable, as demonstrated by session cookies generated by using the uniqid function.

Patch / fix

  • php RHEL 4 4.3.9-3.31
  • php RHEL 5 5.1.6-27.el5_5.3
  • php-gd RHEL 4 4.3.9-3.31
  • php-gd RHEL 5 5.1.6-27.el5_5.3
  • php-cli RHEL 5 5.1.6-27.el5_5.3
  • php-dba RHEL 5 5.1.6-27.el5_5.3
  • php-pdo RHEL 5 5.1.6-27.el5_5.3
  • php-xml RHEL 5 5.1.6-27.el5_5.3

red hat advisories RHSA-2010:0919

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2010-1128 updated cvss 2.6

php: LCG entropy weakness

  • Red Hat Enterprise Linux (v. 5 server) php 5.1.6-27.el5_5.3, php-gd 5.1.6-27.el5_5.3, php-cli 5.1.6-27.el5_5.3, php-dba 5.1.6-27.el5_5.3, php-pdo 5.1.6-27.el5_5.3, php-xml 5.1.6-27.el5_5.3, +12 more Red Hat Enterprise Linux AS version 4 php 4.3.9-3.31, php-gd 4.3.9-3.31, php-imap 4.3.9-3.31, php-ldap 4.3.9-3.31, php-odbc 4.3.9-3.31, php-pear 4.3.9-3.31, +7 more Red Hat Enterprise Linux Desktop version 4 php 4.3.9-3.31, php-gd 4.3.9-3.31, php-imap 4.3.9-3.31, php-ldap 4.3.9-3.31, php-odbc 4.3.9-3.31, php-pear 4.3.9-3.31, +7 more Red Hat Enterprise Linux Desktop Workstation (v. 5 client) php 5.1.6-27.el5_5.3, php-gd 5.1.6-27.el5_5.3, php-cli 5.1.6-27.el5_5.3, php-dba 5.1.6-27.el5_5.3, php-pdo 5.1.6-27.el5_5.3, php-xml 5.1.6-27.el5_5.3, +12 more Red Hat Enterprise Linux ES version 4 php 4.3.9-3.31, php-gd 4.3.9-3.31, php-imap 4.3.9-3.31, php-ldap 4.3.9-3.31, php-odbc 4.3.9-3.31, php-pear 4.3.9-3.31, +7 more Red Hat Enterprise Linux WS version 4 php 4.3.9-3.31, php-gd 4.3.9-3.31, php-imap 4.3.9-3.31, php-ldap 4.3.9-3.31, php-odbc 4.3.9-3.31, php-pear 4.3.9-3.31, +7 more
    fixed: vendor fix RHSA-2010:0919

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (EDB-33677)
  2. Published

Exploit prediction

8.09% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-33677 PHP 5.3.1 - LCG Entropy Security dos, 2010-02-26
  • securityfocus.com http://www.securityfocus.com/bid/38430 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:P/A:N

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.