fs_read_glyphs() heap buffer overflow via cumulative glyph data overflow in libXfont2
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 2.0.3-150000.3.6.1, 2.0.7-160000.5.1, 2.0.3-3.6.1, 2.0.6-5.el10_2.3, 2.0.3-2.el8_10.3, and 2 more
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation. A malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.7-160000.5.1
- libXfont2-2
fixed in 2.0.7-160000.5.1
- libXfont2-2
fixed in 2.0.7-160000.5.1
- libXfont2-2
fixed in 2.0.7-160000.5.1
- libXfont2-2
fixed in 2.0.7-160000.5.1
- libXfont2-2
fixed in 2.0.7-160000.5.1
- libXfont2-2
fixed in 2.0.7-160000.5.1
- libXfont2-2
fixed in 2.0.7-160000.5.1
- libXfont2-2
fixed in 2.0.3-3.6.1
- libXfont2-2
fixed in 2.0.3-3.6.1
- libXfont2-2
fixed in 2.0.3-3.6.1
- libXfont2-2
fixed in 2.0.3-3.6.1
- libXfont2-2
fixed in 2.0.3-3.6.1
- libXfont2-2
fixed in 2.0.3-3.6.1
- libXfont2
fixed in 2.0.6-5.el10_2.3
- libXfont2-devel
fixed in 2.0.6-5.el10_2.3
- libXfont2
fixed in 2.0.3-2.el8_10.3
- libXfont2-devel
fixed in 2.0.3-2.el8_10.3
- libXfont2
fixed in 2.0.3-12.el9_8.3
- libXfont2-devel
fixed in 2.0.3-12.el9_8.3
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.7-160000.5.1
- libXfont2-devel
fixed in 2.0.7-160000.5.1
- libXfont2-2
fixed in 2.0.7-160000.5.1
- libXfont2-devel
fixed in 2.0.7-160000.5.1
- libXfont2-2
fixed in 2.0.3-3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.3-150000.3.6.1
- libXfont2-devel
fixed in 2.0.3-150000.3.6.1
- libXfont2-2
fixed in 2.0.7-160000.5.1
- libXfont2-devel
fixed in 2.0.7-160000.5.1
- libXfont2-2
fixed in 2.0.7-3.1
- libXfont2-2-32bit
fixed in 2.0.7-3.1
- libXfont2-devel
fixed in 2.0.7-3.1
- libXfont2-devel-32bit
fixed in 2.0.7-3.1
- libXfont
through 2.0.8