VIR Vulnerability Intelligence Relay

CVE-2009-1959

unknown
Published — · Modified —
💬 Discuss on Community ✚ Propose mitigation
CVSS v3
—
CVSS v4 NEW
—
not yet in upstream
VIR risk
1.0

Description

Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.

Predictions

Exploit likelihood
20%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-33041 dos linux verified text · 1 KB
nemo · 2009-05-15

Irssi 0.8.13 - 'WALLOPS' Message Off-by-One Heap Memory Corruption

text exploit Source: Exploit-DB 
source: https://www.securityfocus.com/bid/35399/info

Irssi is prone to an off-by-one, heap-based, memory-corruption vulnerability because it fails to properly bounds-check user-supplied data before copying it into a memory buffer.

Attackers can exploit this issue to crash the vulnerable client, resulting in a denial-of-service condition. Given the nature of this issue, attackers may also be able to run arbitrary code within the context of the vulnerable application, but this has not been confirmed.

Iirssi 0.8.13 is vulnerable; other versions may also be affected. 

The following example IRC command is available; please see the references for more information.

: WALLOPS \001ACTION

OS impact
debian Debian Fixed 5 releases
VersionStatusFixed in
trixie Fixed 0.8.13-2
sid Fixed 0.8.13-2
forky Fixed 0.8.13-2
bullseye Fixed 0.8.13-2
bookworm Fixed 0.8.13-2

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.