IRSSI-SA-2017-06 Irssi Security Advisory [1]

CVE-2017-9468, CVE-2017-9469

Description

Two vulnerabilities have been located in Irssi.

  1. When receiving a DCC message without source nick/host, Irssi would attempt to dereference a NULL pointer. Found by Joseph Bisch. (CWE-690)

    CVE-2017-9468 [2] was assigned to this issue.

  2. When receiving certain incorrectly quoted DCC files, Irssi would try to find the terminating quote one byte before the allocated memory. Found by Joseph Bisch. (CWE-129, CWE-127)

    CVE-2017-9469 [3] was assigned to this issue.

Impact

  1. May result in denial of service (remote crash).

  2. May result in denial of service (remote crash), but in practice this seems to be very unlikely unless address sanitizer is enabled.

Affected versions

  1. All Irssi versions that we observed

  2. All Irssi versions that we observed

Fixed in

Irssi 1.0.3

Upgrade to Irssi 1.0.3. Irssi 1.0.3 is a maintenance release in the 1.0 series, without any new features.

After installing the updated packages, one can issue the /upgrade command to load the new binary. TLS connections will require /reconnect.

Mitigating facts

  1. requires control over the ircd

Patch

irssi/irssi@fb08fc7f1...

References

  1. https://irssi.org/security/irssi_sa_2017_06.txt
  2. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9468
  3. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9469