DescriptionThe sdump function in sdump.c in fetchmail 6.3.11, 6.3.12, and 6.3.13, when running in verbose mode on platforms for which char is signed, allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via an SSL X.509 certificate containing non-printable characters with the high bit set, which triggers a heap-based buffer overflow during escaping.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
fetchmail (PTS)buster6.4.0~beta4-3+deb10u1fixed
sid, trixie6.4.38-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
fetchmailsourceetch(not affected)
fetchmailsourcelenny(not affected)


[lenny] - fetchmail <not-affected> (This issue was introduced in 6.3.11)
[etch] - fetchmail <not-affected> (This issue was introduced in 6.3.11)
the conditions so that this is exploitable are rather obscure

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