CVE-2009-4016

Severity: medium (CVSS 6.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2010-02-04 · updated 2026-06-16
Weakness: CWE-189

Description

Integer underflow in the clean_string function in irc_string.c in (1) IRCD-hybrid 7.2.2 and 7.2.3, (2) ircd-ratbox before 2.2.9, and (3) oftc-hybrid before 1.6.8, when flatten_links is disabled, allows remote attackers to execute arbitrary code or cause a denial of service (daemon crash) via a LINKS command.

Affected products

Ircd-Hybrid: 7.2.2, 7.2.3
Ircd-Ratbox: through 2.2.8; 1.0, 1.1, 1.1.1, 1.1.2, 1.2.1, 1.2.2 (+47)
Oftc-Hybrid: through 1.6.7; 1.4.0, 1.4.1, 1.5.0, 1.5.1, 1.5.2, 1.5.3 (+11)

References

http://lists.ratbox.org/pipermail/ircd-ratbox/2010-January/000891.html
http://secunia.com/advisories/38210
http://secunia.com/advisories/38381
http://secunia.com/advisories/38382
http://secunia.com/advisories/38383
http://security.debian.org/pool/updates/main/i/ircd-hybrid/ircd-hybrid_7.2.2.dfsg.2-4+lenny1.diff.gz
http://svn.ircd-hybrid.org:8000/viewcvs.cgi?rev=1044&view=rev
http://trac.oftc.net/projects/oftc-hybrid/browser/tags/oftc-hybrid-1.6.8/RELNOTES
http://www.debian.org/security/2010/dsa-1980
http://www.securityfocus.com/bid/37978
http://lists.ratbox.org/pipermail/ircd-ratbox/2010-January/000891.html
http://secunia.com/advisories/38210

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