Description
The shared memory scoreboard in the HTTP daemon for Apache 1.3.x before 1.3.27 allows any user running as the Apache UID to send a SIGUSR1 signal to any process as root, resulting in a denial of service (process kill) or possibly other behaviors that would not normally be allowed, by modifying the parent[].pid and parent[].last_rtime segments in the scoreboard.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗Advisories 3
- DSA-187 apache - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-195 apache-perl - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-188 apache-ssl - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- DSA-188 vendor-advisory
- http://marc.info/?l=apache-httpd-announce&m=103367938230488&w=2
- ESA-20021007-024 vendor-advisory
- HPSBUX0210-224 vendor-advisory
- DSA-187 vendor-advisory
- SSRT090208 vendor-advisory
- 20021003 iDEFENSE Security Advisory 10.03.2002: Apache 1.3.x shared memory scoreboard vulnerabilities mailing-list
- http://www.apacheweek.com/issues/02-10-04
- 5884 vdb-entry
- DSA-195 vendor-advisory
- 20021003 [OpenPKG-SA-2002.009] OpenPKG Security Advisory (apache) mailing-list
- apache-scorecard-memory-overwrite(10280) vdb-entry
- MDKSA-2002:068 vendor-advisory
- CLA-2002:530 vendor-advisory
- 20021017 TSLSA-2002-0069-apache mailing-list
- 20021015 GLSA: apache mailing-list
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073140 [1/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.ht mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [2/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210422 svn commit: r1074079 [2/3] - in /websites/staging/httpd/trunk/content: ./ apreq/ contribute/ contributors/ dev/ docs-project/ docs/ info/ mod_fcgid/ mod_ftp/ mod_mbox/ mod_smtpd/ modules/ security/ test/ test/flood/ mailing-list
- [httpd-cvs] 20210606 svn commit: r1075470 [1/4] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-13938.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabiliti mailing-list