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Vulnerability of lftp: denial of service via Reverse Mirroring

Synthesis of the vulnerability 

An attacker can generate a fatal error via Reverse Mirroring of lftp, in order to trigger a denial of service.
Impacted software: openSUSE Leap, Solaris, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 03/08/2018.
Références of this announce: bulletinjan2019, CVE-2018-10916, openSUSE-SU-2019:1059-1, openSUSE-SU-2019:1110-1, RHSA-2020:1045-01, SSA:2018-214-01, SUSE-SU-2019:0642-1, SUSE-SU-2019:0643-1, USN-3731-1, USN-3731-2, VIGILANCE-VUL-26902.

Description of the vulnerability 

An attacker can generate a fatal error via Reverse Mirroring of lftp, in order to trigger a denial of service.
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This security alert impacts software or systems such as openSUSE Leap, Solaris, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this security weakness is medium.

The trust level is of type confirmed by the editor, with an origin of internet server.

An attacker with a expert ability can exploit this security announce.

Solutions for this threat 

openSUSE Leap 15.0: new lftp packages.
New packages are available:
  openSUSE Leap 15.0: lftp 4.8.3-lp150.3.3.1

openSUSE Leap 42.3: new lftp packages.
New packages are available:
  openSUSE Leap 42.3: lftp 4.7.4-2.6.1

Oracle Solaris: patch for third party software of January 2019 v2.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

RHEL 7: new lftp packages.
New packages are available:
  RHEL 7.0-7.7: lftp 4.4.8-12.el7

Slackware: new lftp packages.
New packages are available:
  Slackware 14.0: lftp 4.8.4-*-1_slack14.0
  Slackware 14.1: lftp 4.8.4-*-1_slack14.1
  Slackware 14.2: lftp 4.8.4-*-1_slack14.2

SUSE LE: new lftp packages.
New packages are available:
  SUSE LE 12 SP3: lftp 4.7.4-3.6.1
  SUSE LE 12 SP4: lftp 4.7.4-3.6.1
  SUSE LE 15 RTM: lftp 4.8.3-4.3.1

Ubuntu: new lftp packages.
New packages are available:
  Ubuntu 18.04 LTS: lftp 4.8.1-1ubuntu0.1
  Ubuntu 16.04 LTS: lftp 4.6.3a-1ubuntu0.1
  Ubuntu 14.04 LTS: lftp 4.4.13-1ubuntu0.1
  Ubuntu 12.04 ESM: lftp 4.3.3-1ubuntu0.1
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