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CVE-2007-1558 · cross-distro fix matrix

CVE-2007-1558: The APOP protocol allows remote attackers to guess the first 3 characters of a password via man-in-the-middle (MITM) attacks that use crafted message IDs and MD5 collisions. NOTE: this design-level issue potentially affects all products that use APOP, including (1) Thunderbird 1.x before 1.5.0.12 a

Affects 3 Linux releases across 15 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2007-1558 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

  • balsa→ fixed in2.3.17-1urgency: unimportant
    sudo apt-get install --only-upgrade -y balsa
  • claws-mail→ fixed in2.9.1-1urgency: unimportant
    sudo apt-get install --only-upgrade -y claws-mail
  • fetchmail→ fixed in6.3.8-1urgency: unimportant
    sudo apt-get install --only-upgrade -y fetchmail
  • mailfilter→ fixed in0.8.2-1urgency: unimportant
    sudo apt-get install --only-upgrade -y mailfilter
  • mutt→ fixed in1.5.18-6urgency: unimportant
    sudo apt-get install --only-upgrade -y mutt

Debian bookworm

Source: Debian Security Tracker

  • balsa→ fixed in2.3.17-1urgency: unimportant
    sudo apt-get install --only-upgrade -y balsa
  • claws-mail→ fixed in2.9.1-1urgency: unimportant
    sudo apt-get install --only-upgrade -y claws-mail
  • fetchmail→ fixed in6.3.8-1urgency: unimportant
    sudo apt-get install --only-upgrade -y fetchmail
  • mailfilter→ fixed in0.8.2-1urgency: unimportant
    sudo apt-get install --only-upgrade -y mailfilter
  • mutt→ fixed in1.5.18-6urgency: unimportant
    sudo apt-get install --only-upgrade -y mutt

Debian trixie

Source: Debian Security Tracker

  • balsa→ fixed in2.3.17-1urgency: unimportant
    sudo apt-get install --only-upgrade -y balsa
  • claws-mail→ fixed in2.9.1-1urgency: unimportant
    sudo apt-get install --only-upgrade -y claws-mail
  • fetchmail→ fixed in6.3.8-1urgency: unimportant
    sudo apt-get install --only-upgrade -y fetchmail
  • mailfilter→ fixed in0.8.2-1urgency: unimportant
    sudo apt-get install --only-upgrade -y mailfilter
  • mutt→ fixed in1.5.18-6urgency: unimportant
    sudo apt-get install --only-upgrade -y mutt
Are YOU affected by CVE-2007-1558?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

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